Lever action rifle Offset Hammer Spur extension. Slip over hard-to-reach or hard-to-cock hammers for extra leverage. A must have for low slung scoped guns with external hammers. Blued steel, knurled surface for easy gripping. Fits most hammer-type guns, either right or left side, that have flat surface hammer. *not recommended for fluted or concave hammers. #1) Marlin; made 1983 or later, including 39A, 39M, 1984, 1984C, 1985S, 336C, 336T, 375, 444S, Glenfield 30A - #2) Ruger Blackhawk, H & R Topper, New England Firearms Handi Rifle. sorry SOLD OUT check the mm dimensions in the pic as one might fit other rifles. I have 222 Loctite listed and its recommended to use on the grub screw. + check the dimensions in the pic as one might fit other rifles. + I have 222 Loctite listed and its recommended to use on the grub screw.