A Class 1 or Class 2 receiver has a 1-1/4” opening and is typically only used on cars for towing small trailers or supporting a bike rack. Class 3 and Class 4 receivers have a 2” opening. You'll find these on larger SUV's (the body-on-frame type, not crossovers,) and pickup trucks. A Class 3 receiver can handle up to 6,000 lbs (depending on design,) while a Class 4 can go up to 10,000 lbs. (Again, that's design-dependent.)
The hitch pin is 5/8" in diameter and so has an area of about 0.30 sq-inches. Grade 5 fasteners under 1" have a minimum proof of 85 ksi and grade 8 120 ksi. So a 5/8" grade 5 rod (or bolt with minor diameter of 0.625", so make sure to use a shouldered bolt long enough that the unthreaded part spans both receiver holes) will minimally tolerate about 25,500 lbf and grade 8 about 36,000 lbf without deformation.
The hitch pin is 5/8" in diameter and so has an area of about 0.30 sq-inches. Grade 5 fasteners under 1" have a minimum proof of 85 ksi and grade 8 120 ksi. So a 5/8" grade 5 rod (or bolt with minor diameter of 0.625", so make sure to use a shouldered bolt long enough that the unthreaded part spans both receiver holes) will minimally tolerate about 25,500 lbf and grade 8 about 36,000 lbf without deformation.
I recieved this a few days ago. It came in a nicely packed, sturdy box. After opening it up and seeing it for myself, I have to say the quality is awesome! Its a HEAVY shackle. The matte finish on the reciever end is superb (this piece must weigh about 7-10 lbs on its own). The shackle itself has a nice galvanized coating, and weighs about 6-7 lbs! Overall I think it is an awesome addition to any truck, looks great and has all the functionality that you'll probably need out of a shackle. 5/5 would reccomend! 457088

Love this receiver, gives you another attachment point that you can count on. This is my main recovery point, and whenever I am in the trails I already have this attached with a D ring to my recovery strap. I used multiple times and is one of the strongest points to attach to. This also gives you the option to hook up just when you need it, and if you have other vehicles with a class 3 hitch you can transfer to any of them. This is a must if if have vehicles or equipment that could get stuck. No only that, but this is a fraction of the cost of purchasing a custom bumper with recovery attachment points.

Whether you are moving, attaching a trailer to your truck, or simply preparing for the future, truck hitches are a great way of ensuring that your truck can always haul everything that it needs to. Truck hitches are a very effective tool that can be used for hooking up your truck to a separate trailer or anything that has wheels and the opposite truck hitch for connecting it. Although there are many benefits that can come with owning your own truck hitch, many people are turned off by the ridiculous prices that some outlets offer.

Affordable and efficient strap-and-shackle system attaches to your Rhino-Rack Heavy-Duty crossbar to secure a ladder or other cargo to your roof rack. Cam-action buckle locks the strap in place; a snap-on shackle anchors the strap to your crossbar. Call 800-298-8924 to order Rhino Rack accessories and parts part number RLS5 or order online at etrailer.com. Free expert support on all Rhino Rack products. Guaranteed Lowest Price and Fastest Shipping for Cam-Lock Ladder Strap with Snap Shackle for Rhino-Rack Heavy-Duty Crossbars - 20" Long. Accessories and Parts reviews from real customers.
Not everybody needs to be able to tow this amount of weight. For these people, you might instead opt to get a receiver hitch or ball mount hitch since they will normally clock in around 5,000 or fewer pounds in towing weight capacity. If you don’t envision ever needing a hitch which can handle weights which are more than usual, you should simply get a ball mount of the receiver hitch.
It's made from a solid steel construction. It's going to offer three pinhole locations, so you have one right here and then two on this side. That's going to allow the shackle to be used horizontally or vertically, and it's got the short mounting shank. That's going to enable the shackle to sit pretty close to the receiver that's mounted onto the vehicle. We have a screw pin design.

Rhino Hitch products are both beautiful and strong, like our namesake animal. If you have been searching for the best custom adjustable hitch for your truck, then look no further! The Rhino Hitch is the most versatile, custom adjustable hitch on the market today and we proudly manufacture our custom hitches here in the USA. Our tow hitch is rated to pull up to 14,000 pounds of cargo. So, it really doesn’t matter if you’re hauling a boat for a day on the lake, a motor home for a trip to the dunes, or a trailer full of equipment for your job, because the adjustable Rhino Hitch will pull anything within the weight limit. More than that, we assure you that the hitches are sturdily built using high-quality billet aluminum. With few moving parts and fastened by industrial-strength bolts, your Rhino Hitch ensures a lifetime of heavy lifting.
Alibaba.com offers 4 big shackle hitch products. About 50% of these are trailer parts. A wide variety of big shackle hitch options are available to you, such as trailer plugs, trailer suspension. You can also choose from paid samples. There are 4 big shackle hitch suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of big shackle hitch respectively. Big shackle hitch products are most popular in Mid East, Southeast Asia, and South America.
Last on the list is the Trailhead multi mount trailer hitch d ring. Very similar to the other Shackles on the list. Has multi point positioning to spin the d ring horizontal and vertical. This one  is rated up to a hefty 11,000 lbs just like the rest. Included is a set of D-Shackle side isolator rings that eliminate shackle rattle when the unit is mounted to your vehicle’s hitch. A little bit from each of the others on the list, this is still a solid option. 
Recovery straps are an essential item in your off-road gear bag. Straps and shackles might be one of the most important items you can carry around with you at all times in your 4Runner. For the core accessories, you should carry around straps, recovery hitch receivers, shackles, jumper cables, flashlights, general tools, first-aid kits, along with a few others.
First question I had was if it was square tube or a solid chunk.. it is definitely a solid chunk of steel. This thing has some heft to it, which is a good feeling. I have a 3/4 avalanche that’s heavy. I used this thing right away. First day I watched a heavy loaded military hummer go in the ditch and get stuck, and they let me pull them out. I was right there, so they hadn’t called it in yet.
Heavy, solid, and it fits the 2″x2″ receiver perfectly. A 5/8″ locking hitch pin is now needed. Has to be a locking type because this shackle is so attractive a thief could hardly pass it up. In doing research, I found that hitch pins come in different lengths; I had bought one that was a bit too short to pass through the holes in my Toyota Tacoma receiver, which has 1/2″ thick walls. So beware.

You can see the large opening space that we have here. I'll take a measurement of that here in a moment. On the shackle itself it's going to give you the diameter which again is 1-1/2" and then on this side it's going to say WLL, that's working load limit, of 17 tons. This is CNC machined when it comes to the solid steel mount. You can see here on the back side solid steel construction. It has a really nice nickel plating on it so it's going to stand up really well against rust and corrosion too. You're going to notice that it's going to have a 5/8" pin hole here on the side as well as here on the top.
We get it. Your gear takes a serious beating, and you demand the best from your equipment. Anything less is going to leave you frustrated & potentially stranded. That’s why you chose this D-ring hitch receiver from Vault Cargo Management. We powder coated it to ensure that when you need to use it, it’s in great shape & ready to roll. Simply loop your tow strap through the D-ring shackle, slap it into the shackle hitch receiver, and you’re ready to roll.
Mile Marker comes in at spot number three because of its cool orange color and multi hole configuration. Its prolly the most expensive on this list, with the same features and towing capacity as the others. It has a 11,000 pound working load. And you can insert the hitch two different ways, which will make your d ring shackle go vertical or horizontal. A cool added feature to help you get out of a sticky situation. Made for 2″ receiver and 3/4″ d-ring like the others.
I looked at several similar items before purchasing this one. Where the d-ring bolt goes thru, a couple of other brands had thin "ears" welded to the end of the mount. Not being a believer in factory claims of tow ratings, these didn't have the look of strength they claimed. This hitch appears to be milled from a solid piece of steel. If it indeed is 2 pieces welded together, they did an outstanding job in doing so. Unless I need to use a ball-mount hitch, I plan to leave this mounted in the receiver. To that end, I put some Loctite on the bolt before screwing it into the shackle, and then added a small cable tie from the bolt eye to the shackle. Barring a determined shackle thief, it should always be there if I need it. I can't imagine backing into something that would harm this hitch. The only complaint I have is how loose the mount is in the receiver. Several wrappings of duct tape just in front of the hitch pin hole quieted the rattle. A more snug fit would have earned 5 stars.

Another safety note is to weigh down the strap or winch cable, (especially a winch cable.) The reason is that if it was to snap the ends would whip around violently, injuring anyone in their way. A heavy blanket thrown over the strap or cable will do the job. Alternatively, if your recovery accessories come in a handy bag, fill it with something heavy and suspend it from the strap.

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