This 100mm medium duty pressed steel swivel caster with brake and a 12mm bolt hole fitting is suitable for spark-free environments where it is important to have electrically conductive wheels, such as hospitals, pharmaceuticals, and other chemical industrial sectors. Anti static castors with a brake are electrically conductive and prevent the build-up of static. The useful foot-operated brake simultaneously brakes both the swivel head and the wheel 100mm Bolt Hole Braked Castor Anti Static Rubber Wheel