GrovTec US Inc Hammer Extension - Henry Single Shot and Henry Big Boy (Post 2010) - Adding a horizontal extension to hammers provides a larger contact surface and outstanding grip and control. Especially useful on scoped firearms where clearance can become an issue, GrovTec hammer extensions are made with the finest materials and finish in the industry. Can be mounted on the right or left side. Each hammer extension is specific to the firearms it fits. Fits Henry Single Shot and Henry Big Boy Centerfire Rifles, Post 2010 models Steel with a black finish