HOLKIE Leveling Stem Casters Set of 4 Heavy Duty Retractable Caster Wheels, 1/2" and M12 Stem Size, Total Capacity 2200 Lbs, Adjustable Wheel with Ratchet Handle for Workbench, Machine, Equipment

Work great. I installed these on a 300lb piece of equipment. They glide easily across garage floor. Just make sure floor is clean. They ratchet works great and lift the foot so the wheel is cleared. You can level the equipment to a point. It all depends on your floor.

I have these casters on an adjustable frame bed, as the wheel kit from Tempurpedic is made of unobtanium and I was having a hard time moving the king size bed around on the rubber feet. I like these wheels came with 2 sets of threaded stems, 1/2 inch is what i needed for my older setup. Most of the newer adjustable frame beds have 6 legs and m8 fasteners, this one is only 4 sae 1/2" -13 thread bolts. I had the 12 inch legs which are now too high for comfortably getting in and out of bed, I used to keep storage under the bed but no longer need that, so these brought the bed height down to where the frame is 4.5 inch above the floor. This is the perfect height for sitting on the edge of the bed and easily getting in and out in the middle of the night. One feature i am pleased with on these wheels is the leveling feature, which acts to lock the wheel from rolling and it is easy to release if the bed needs to be moved. I had to buy 2 sets of these to work with the 2 bed platforms with 4 casters on each and had to rearrange the outer bed frame rails to be lower. It all worked out beautifully, and less than half the cost of trying to piece together random ebay sets that were over a hundred bucks each and didnt have the locking features, plus I could only find 1 set of 6 inch legs. If i need to I can fab up some extensions to bring the bed back up to its previous height, but i think it will be perfect as it is. There is room for the power adapters, mattress pumps, and even the Chili Pad Dock Pro fits under the foot of the bed with no issues. I also had room enough to store my CPAP UPS under there, though I don't really need a UPS anymore with the newer 24v system, a couple 12 batteries can power that thing all night without an inverter whining. I digress.TL/DR Good wheels, high load capacity, holds a 400 pound man on a 250# bed frame with a 60# mattress and about 10# cooling pad and 25# weighted blanket.

These work perfectly on my CSL GT sim cockpit. Perfect!

I have used these in the past with great success. These however are slightly less quality than what I have purchased in the past. I received these and install them on a Machine I move around and use these levelers for holding position and to level the items they are attached to. These are 3300 lbs units and should be more robust than lesser weights units. However out of the box I received a set that was defective. I will say Amazon made these good quickly and the replacement was sent out right away. I still feel that the quality lis less than the past. They were slightly beat up with paint scars and dings on both pair received. The boxing was also slightly sub par. I will say they do work well and I will order again when needed. But because of the issues discussed above I only give them 4 stars. Again Amazon customer service was great with quick replacement of the items.

WOW these things are awesome they allow me to move my 2000lb metal brake with ease. im not sure whats so confusing about these casters but they function just like the say. they come with both metric and and sae studs, follow the instructions and you will have no problems.

Nice, good quality leveling casters. Worth the extra $10.

I bought two sets of these - the 2200lbs and 3300lbs rated sets. In both sets, one of the casters arrived with a non-functional ratchet mechanism under load. This meant that I would have had to lift the machine in order to use the ratchet mechanism. One was even so bad that under no load it still would skip and fail to ratchet, making it completely useless. A 25% failure rate is horrendous, and if the failure rate out of the box is that high, how high will it be in a few years?The second issue is that the leveling foot in both models is hard plastic - incompressible and prone to sliding on hard surfaces. This meant my machines, which do vibrate, slowly migrated across the floor while running. As these machines do need to remain fairly level, this meant I would slowly loose the level as the machines moved across the floor.The third issue applies to just the 3300lb rated set. They are advertised as having an M12 thread, but in reality they are an M16 thread with a specialized adapter stud to adapt the M16 threads in the caster to an M12 stud. This likely won't be an issue for most people, but if your machine has an M12 stud already installed in it, then the 3300lb set won't work. The 2200lb set does have a M12 thread in the caster itself, so will accept a stud already installed on your machine.Several other minor issues: paint is flaking on multiple units, the leveling foot is rather sloppy so the machine can still rock back and forth slightly with the leveling foot down (worse on the larger set), and the small caster wheel itself rolls poorly as it is a cheap, hard caster wheel.Ultimately, these feel like the worst of both worlds - an unstable, poorly gripping leveling foot that does not give you the solid foundation of a normal adjustable foot and a cheap, hard to roll caster that spends more time sliding and catching in any little defect in the floor rather than rolling. These are great for neither moving the machine nor keeping it stable & level in one place.

I would have given it 5 stars if the tapped holes were deeperThe studs screw in 2 turns before getting tight. I locked double nuts for tightening the studs thinking the threads were tight but it ended up locking the swivel. Now the adjustment for the leveling pads is bent. Learn from my mistake