Stem Caster, Swivel Caster with Brake, 100 lb Load Rating, 0 to 299 lb, 2 3/8 in Wheel Dia., 3/16 in Wheel Width, Nylon Wheel/Tread Material, 2 3/4 in Mounting Height, Plain, 5/16 In.-18 x 1 in Caster Stem Size, Threaded, Nylon Caster Frame Material, Nylon Frame Finish, Yes Non-Marking, 2 Number of Wheels