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 all Marlin lever actions made in 1983 or later, including 39A, 39M, 1984, 1984C 1985S 336C, 336T, 375, 444S, Glenfield 30A.