Insert Systems Plastic or aluminium inserts for gentle clamping        The use of inserts in a softer material can be an advantage when you need to clamp machined diameters during finishing operations. In this instance we offer to supply a range of plastic or aluminium inserts either standard width or wide to leave no marks when you clamp the workpiece. The support jaws can be steel or aluminium depending on the application and can be for serrated or slot and tenon style chucks. This method of clamping is often used to hold fragile parts that would be marked or distorted in steel jaws.