Quality Australian Made O Series Heavy Duty Castors are able to carry up to 500 kg each, the range of heavy duty O Series castors are available in 100, 125, 150 and 200 mm sizes, and in a wide range of wheel types. Easy process to order: 1> Pick wheel type - Blue and grey high resilience elastomer, polyurethane on nylon, hard nylon 2> Pick Fork Type - Basic zinc finish (no lacquer) in swivel plate, fixed plate, bolt hole and total brake configurations 3> Pick plate base type - North American (NA) or International (ISO) 4> Call Us with above info and quantities Scroll Down to see the many options / combinations.