Uncle Mikes' Hammer Extension slips over the existing hammer to make hard to reach or hard to cock hammers easier to use - a must for scoped guns with external hammers. It is made of blued steel with a knurled surface for easy gripping. Included is an allen wrench. This model is compatible with Ruger Blackhawk, H&R Topper, New England Firearms Handi-Rifle.Uncle Mike's hammer extension slip over hard-to-reach or hard-to-cock hammers for extra leverage. A must for scoped guns with external hammers. Blued steel, knurled surface for easy gripping. Fits most hammer-type guns, either right or left side (Allen wrench included). For Ruger Blackhawk/H&R Topper/Handi-Rifle. Features: For either right or left hand use Knurled surface to improve grip Allows for easy hammer pull with low-mount scopes