Supports a total weight of 1,200lbs 300lbs/per caster.5 Phenolic Wheel Swivel 7/16'' Grip Ring Stem Caster Set 2 Total Lock Brake, 4PK Service Caster is unsurpassed in quality, reliability, and excellent customer service. The phenolic wheels have a high resistance to impact damage while providing protection for floors in commercial and industrial settings. All rolling on a finely crafted ball bearing design and zinc plated finish that provides durability under any condition and keeps you safely moving forward.