In this series of radius forming punches, a variety of radius forming inserts are used with a standard Tang.
Unlike in Air Craft radius forming punch no.s P120-127, these punches are bolted on to the tongue by means of ¼"-20 S.H.C.S.
Up to 2" the radius inserts are made of solid centerless ground. 1045 Carbon steel. Over 2", the inserts are made of heavy wall tubing (approx. ½" wall), with a ground finish on O.D.
Both types of inserts are grooved to position the Tang.