Total-Locking Bolt-In Stem Caster with Round Stems for Scaffolding, Swivel Caster with Total Lock, 500 lb Load Rating, 300 to 999 lb, 6 in Wheel Dia., 2 in Wheel Width, Rubber Wheel/Tread Material, 7 11/32 in Mounting Height, Roller, 1-3/8 in x 3-7/8...