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.) No low wall or high wall designs. Fits Ruger Blackhawk, H & R Topper, New England Firearms Handi Rifle.