Penn Elcom - W0999 - 100mm / 4" Heavy Duty Swivel Castor. Penn Elcom Sale! from 9722 /per Qty. Add to Cart 100mm Heavy Duty Swivel Castor.Green Polyurethane/Cast Iron Wheel with Roller Bearings.Grease Nipple for Bearings and Wheel Axle. Part No. W0999 Material Steel/Cast Iron Finish Zinc Style Swivel Load Capacity 317kg Weight 2.15kg Qty available:36 SKU:W0999 Castors - 100mm