Safety Series Carpet Casters, Oversize Neck, 3/8" Dia. x 7/8" Long Stem, 110 lbs./Caster, Matte Black Finish, 5/Set (65435) 100% Nylon Patented Roll Control Internal brake prevents wheels from rolling freely when user stands. Allows smooth effortless chair rolling while seated. 2" diameter dual hooded wheels. Oversized 1-1/2" dia. neck fits 1-1/2" dia. chair legs creating the illusion of a solid unit. Hard nylon wheels for use on carpeted surfaces. 3/8" dia. x 7/8" long stem fastener for metal bases. Weight Rating: 110 lbs/Caster. Matte Black Finish, 5/Set