200mm Top Plate Fixed Castor with 140x73mm Bolt Ho... Read Morele Centres each suiting an M10 fixing bolt. The heavy duty bracket is made from pressed steel with a bright zinc finish. The Cast Iron Wheel contains a Roller Bearing to reducing rolling resistance. The Load Capacity of this castor is 1090kg.Cast Iron Castor Wheels are a great choice for many rough service applications because they are strong, shock resistant and have a long working life. They have a very low tractive resistance which aids in the ease of movement and are not susceptible to picking up swarf and other floor debris which may hamper the performance of other Castor Wheel materials.