Each Weaver base is machined to tight tolerances for a custom fit. These Aluminum bases offer maximum strength for rings to hold tight. Custom hardened fastening screws come with every Weaver base Fits: Anschutz Mark 12, front and rear H&R 250, 251, 264, 265, 365, 450 and 550, front Lone Eagle SSP 91 pistol, front and rear Mossberg 40, 43, 44, 144, 46BT and 35, rear Mossberg early models 45, 46, 46A and 46B with 13/16" barrels Remington 514, rear Savage 3, rear Savage 19 and 23, front Savage 93F Heavy Barrel, front and rear Stevens 53, rear Stevens 418 and 4181/2, front or rear Stevens-Springfield 83, rear Winchester 75 Target, front Note: This is only a single mount. You will need to order two mounts for mounting a scope.