Alera ALESW790004 3 Wheel 2 Locking Optional Grip Ring Stem Casters for Wire Shelving - Black (4/Set);

Helps make moving wire shelving easy with the caster kit for wire shelving. Snap-ring around stem makes for easy attachment. Using casters may reduce load capacity for the shelving unit. Bumpers help keep shelving unit from damaging walls. 125 lbs. Per Caster (500 lbs. total). Caster/Glide/Wheel: Four 3" Casters (2 Locking).; Color: Black; Stem Type: Snap Ring; Weight Capacity (text): 125 lbs. Per Caster (500 lbs. total).