4" ball bearing swivel casters Adjustable fit for 1-1/2" diameter table legs Chemical resistant and built to last 2 wheels have a locking brake to keep the table in place Casters arrive fully assembled so they are easy to insert and use This heavy duty set of 4 zinc plated premium casters is designed for Gridmann stainless kitchen prep tables but will fit any legs with a 1-1/2" diameter opening. The composite 4 inch wheel is made of chemical resistant thermoplastic polyurethane and built for use in the commercial kitchen environment. Each wheel can support up to 300 pounds and rolls smoothly and they easily pivot on a full set of ball bearings. The wheels are non-marring and work on almost any surface like tile, concrete, and wood. Two of the wheels have an integrated brake that can be locked down to keep your table in place. The wheels arrive fully assembled and are ready to slide into the legs. Each wheel includes a rubber compression fitting at the top so you can tighten the top ring to get the right fit inside the table leg. Overall size - 7-3/4" tall (this will raise the table by 5 inches), 5-1/4" wide , and the wheel is 4" in diameter.