I've noticed that a lot of guys like casters on their welding table. I came up with a better solution. Instead of casters on 4 legs, I used 10" wheels on 2 legs. The other 2 legs are a little shorter than needed so that I could weld 3/4" nuts to the bottom of them. The 3/4" bolts then make the legs adjustable. The solid legs with bolts are more stable than casters. To move the table, I lift the one end a couple inches and it rolls over debris and junk on the floor very easily. The lower shelf is close enough to the floor that if the table is too heavy, I can put a dolly under the lower support and move it like a trailer dolly. 8" and 10" wheels are cheaper than casters and hold over 400 lbs each.