These twin chrome wheel casters make your displays easy to move for quick presentation changes. They are 2 inch (D) sturdy black plastic with chromed hood. Twin wheel chrome casters have a load capacity of 300 lbs per set of four. They have 1 inch (H) 5/16 inch (D) stems with 18 threads per inch making them very sturdy. The twin wheel chrome casters are easily added to your garment racks just by screwing them in place no tools are needed.