Quality Australian Made X Series Very Heavy Duty Castors are able to carry up to 1000 kg each, the range of heavy duty H Series castors are available in 102, 127, 152 and 203 mm sizes, and available with fully cast iron, or polyurethane on cast iron wheels, in a variety of sizes. Easy process to order: 1> Pick wheel type - Cast iron, polyurethane on cast iron 2> Pick Fork Type - Zinc plated Core Coat™ in swivel plate, fixed plate, wheel brake and direction lock configurations Scroll Down to see the many options / combinations.