Bonny Doon Domed 95-Durometer Urethane Insert for 0.20 kg. or 10-oz. Bonny Doon Forming Hammer

Designed specifically for either the 7-oz. or the new smaller 10-oz. Bonny Doon urethane hammer, 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.