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 & out of spaces & 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(s): Black; Color Family: Black; Stem Type: Grip Ring Stem.