Product description  ONLY compatible with the below SKUs: Rolling Workbenches (UHD20142, UHD20152, UHD20242, & UHD20262) Rolling Cabinets ( UHD20147, UHD20145,, UHD20159, UHD20210, UHD20185, UHD20204, UHD20205, UHD20225, & UHD20227) Storage Cabinets (UHD16221, UHD16234, UHD16236, UHD16238, UHD20133, UHD20143, UHD20148, UHD20153, UHD20158, UHD20162, UHD20163, & UHD20164). Includes 2 UltraHD Swivel Wheels (5" diameter) Non-friction ball bearings for easy rolling Features brakes for added safety Includes 8 bolts (4 bolts per wheel) Bumpers not included  Specification Dimensions: 5" diameter Weight capacity: 500 lbs. Weight: 7 lbs. Model #: WEB128