These adjustable torque handles can be used with any of the standard clamps. Simply screw the adapter into the clamp. The adjustable handles "release" when the desired clamping force is reached to prevent the operator from over clamping the workpiece. The two piece design allows the handle to be quickly attached and detached for machine operations. Set screw 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. They are made from steel with black oxide finish.