Braked Bolt Hole castors made from pressed steel, fitted with a cast iron ball bearing wheel. These bolt hole braked casters range from 80mm-200mm and have a capacity up to 350 Kg per caster. Cast iron wheel castors offer high load capacity compared to many wheel materials, however care must be taken as they can cause floor damage. They are strong and very hard wearing and offer good value for money. They can damage painted floors, in this case you would need to use a castor with a tread.