The Grovtec GTHM70 Hammer Extension Marlin Lever, Black is a horizontal extension to hammers that 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 finest materials and finish in the industry. Can be mounted on the right and left side. Each hammer extension is specific to the firearms it fits. Do not use any hammer extension on a firearm not directly specified in the hammer extensions fit list.