Ok they do exactly what I need. I finally installed them on my workbench last night. It's probably in the 300lb range, so not too bad. First discard the template and take your own measurements. Attach one of the wheels to the base and sculpt a corner. You only need to go up about 1/2 inch for your bench to slide on a smooth surface. If you need more you can probably get a 3/4 inch hub from them. So here are some keys to success. The included screws are heavy and thick and work perfectly. Drill pilot holes first. Model the wheel to determine exactly where you want to mount it on the legs. Mark the center of the 6 mounting holes and then drill them. Make sure it lifts the bench into a rolling configuration and also allows it to rest fully on the leg when taken out. When good, use the same measurements for the other three legs, rinse and repeat. thick, and therefore it will be difficult to change the position of the rollers, so cut once, measure a second time. Also, when lowering, lift slightly to remove part of the spring to keep the lever from banging loudly against the leg. around the corner and cut your leg. I'll add some photos when I remember.