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

Designed specifically to fit 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 insert in the hammer, giving you a domed, 95-durometer face ideal for forming curves.