Bolt hole castor made from a pressed steel bracket, fitted with an Injection polyurethane on nylon core fitted with 2 precision ball bearings. These bolt hole casters range from 100mm - 200mm and have a capacity up to 350 Kg per caster. Polyurethane on nylon centres are quiet and provide a soft cushioned ride and will not damage floors and can be used in food and pharmaceutical applications. Injection Polyurethane was once very expensive which prevented many from using. Our aim has to always offer value for money our polyurethane is now become much more popular and the cost have come down. We recommend all food companies to use this very versatile castor you want be disappointed. Our Injection polyurethane makes the tyres soft to the touch and as such provides a very smooth and cushioned ride and will help reduce any likely vibration.