Bonny Doon Flat 95-Durometer Urethane Insert for 0.45 kg. Bonny Doon Forming Hammer

Designed specifically for the 16-oz. Bonny Doon urethane hammer (and the larger-sized original 10-oz. model), this insert is threaded to be interchangeable with the flat-face, 80-durometer insert of the hammer, giving you a harder, 95-durometer face for your forming needs.