Duet Chair Mat Casters, 7/16" Dia. x 1-3/8" Long Stem, 110 lbs./Caster, Matte Black Finish, 5/Set (64526) 2" dia. dual hooded wheels for light-to-medium duty applications. Soft polyurethane wheels for use on chair mats and hard floor surfaces. 7/16" dia. x 1-3/8" long stem fastener for metal base furniture. Weight Rating: 110 lbs/Caster. Matte Black Finish. 5/Set.