Our dual wheel safety brake casters prevent rolling when no weight is applied and are  made in the USA out of quality materials. The oversized neck creates the illusion of the caster and chair being one unit and we offer the option of hard wheel casters for easily rolling on carpeted surfaces and a soft wheel caster for safe rolling on hard surfaces. These casters are intended for use in metal chair bases and are available in two sizes: 3/8″ x 7/8″ (Stem K) and 7/8″ x 7/8″ (Stem B) and in sets of 4 or 5 casters.