FEATURES: * 2-stage brake for easy on/off control. * 4 swivel casters included.COMPATIBLE CASTERS: 6" Polyolefin: H-3322 6" Rubber: H-3326 6" Steel: H-2112 8" Polyolefin: H-3323 8" Rubber: H-3327 8" Pneumatic: H-3328 10" Pneumatic: H-3329MISCELLANEOUS: * Assembly required.