I bought these to allow me to move my latest project around my shop. I have just built a platform bench for my new cnc router that has a 4' x 8' capacity. I state this because I want to describe the massive size of the overall unit. The bench is made of 4 x 4 beams and plywood, I would estimate it weighing in by itself at over 600 lbs. , the shipping weight of the router on the pallet it arrived on was 630 lbs. so doing the math I have so far a bit over half a ton of weight resting on 6 of these wheels , and by the time everything is build I would suspect I'll have closer to 1500 + lbs. I have been able to easily glide this assembly across my tile floor without any issue whatsoever. And when I raise them on the internal leveling feet, everything becomes extremely stable which is what is needed when operating this machine at high inch per minute cutting speeds. Don't let the size fool you, these are very capable wheels.I'm pretty disappointed with these casters. I bought a set of (4) for a heavy duty welding table that I built. The table weights 460 pounds, the suggested load for (4) casters is 1,100 lbs.These are far more "wobbly" than I wanted. I drilled and tapped the bottom plate of the legs (1/4" plate on the bottom of 3" square tubing). When I have the rubber leveling pads extended the table is definitely not rock solid. It moves 1-2" back and forth with the slightest push sideways.I think the reason for this is that the rubber leveling pad is extended with 1/4" threaded rod (it might be metric, but looks to be no bigger than 1/4"). To extend the pads past the casters and then properly level the table the entire load is supported by a few inches of very thin threaded rod. Chicken feet is what comes to mind.Terribly underbuilt or the load rating is overstated. For $160 for a set of (4) I expected much more. I'll be returning these. Unfortunately I need to cut apart my table in order to get something else to work.This item is solid, I like it, however they didn't add any protection inside the box so one wheel hit the other and the paint fell of... So I went ahead and bought the next round separately so this will not happen again...Perfect caster for my heavy kitchen island. Easy to install and the nylon wheels roll easy on the small hex tiles. The ability to lower the pad and relieve pressure on wheels was the reason i bought these. Sturdy feeling construction.They work great. Used them on a 4'x8' assembly table.bought a second set of four I liked them so much worked Perfect for my Island Project in my kitchen made the wife a sewing table and they got the same wheelsVery nice, but expensive.Good solid product, but I thought I was getting four of them. Very pricey