CasterHQ- 5" X 2" 2 Swivel CASTERS & 2 Rigid Set of 4 - PHENOLIC Wheel - 3,200 lbs Capacity. Features OEM PREFERRED SERIES MAJORITY OF THIS SERIES & WHEELS ARE NSF LISTED RoHS COMPLIANT DOUBLE BALL RACEWAY WITH 5/8 KINGBOLT MATCHING TOTAL LOCK CASTERS AVAIALBLE GREASE FITTING IN RACEWAY & AXLE FOR MAINTENANCE ZINC PLATED / RUST & CORROSION RESISTANT PHENOLIC WHEEL IS STRONG AS STEEL NON-MARKING WHEEL HIGHLY RESISTANT TO CHEMICALS.