Help make moving wire shelving easy with the caster kit for use with Alera? wire shelving. Constructed with a snap-ring around stem that makes for an easy attachment. The 360-degree rotation wheels provide easy mobility for maneuvering the shelving in and out of spaces and around corners. Lock the casters when at rest for added stability. Using casters may reduce load capacity for the shelving unit. Set Includes Two Locking & Two Non-Locking Casters. Caster/Glide/Wheel: Caster; Color: Black; Stem Type: Grip Ring Stem; Weight Capacity (text): 500 lb (125 lb Per Caster).