These handles can be used with any of the standard one-touch clamps. Simply screw the adapter into the clamp. The two piece design allows the handle to be quickly attached and detached for machine operations. Setscrew can be used for more secure attachment. The adapter is intended to stay attached to the clamp. The handle and adapter must be purchased separately. The handle is made from 1045 alloy steel and the adaptor is made from 4135alloy steel. Parts have black oxide finish. Ball knob is plastic.