Braked Bolt castors with a Pressed Steel castor bracket, fitted with a Polyurethane On Aluminium Centre wheel. These bolt hole braked casters range from 80mm-200mm and have a capacity up to 350 Kg per caster. Polyurethane on Aluminium Centre castors offer high load capacity with a light weight construction. They have excellent rolling resistance and offer protection on floors. They are used where weight is critical but a high load castor is required; like in the aviation industry, automotive supply chain or where heavy duty castors are required. Polyurethane On Aluminium Centre with ball bearing wheel centres provide a good rolling resistance which is often a problem.