Founded in 1977, Caster City supplies plate and stem rubber caster wheel of the highest quality. It offers all types of casters, including steel, stainless steel, and pneumatic models. Its product line also includes wheel materials such as phenolic, rubber, polyurethane, polyolefin, and steel. Why do my chair wheels keep breaking? You can attach the casters to the legs with screws. If they come with stems, you can use the same bit as the sleeve’s diameter. When you attach the casters, make sure to drill a hole that is deep enough for the stem to fit.