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, New England Firearms Handi Rifle. Will not fit 1992 and later models.