A Set of 4 Wheel 8" Caster with Cast Iron Hub 1 3/8 Caster Wheel with 2 Lock-in Brakes Scaffolding Rolling Tower CBMscaffold A Set of Four Brand New Double Heavy Duty 8" Rubber Caster Wheel Equipped with step scaffold wheel locking double brakes Solid Stem is 1 3/8" in diameter Have two holes compatible at 2" and 2 1/2"Swivel 360 degree