Nobody makes bases to fit as many guns as Weaver. Yet each base is machined to tight tolerances for a custom fit. They're designed to fight the effects of recoil with a square cut notch that precisely mates to the sturdy cross bolt in every Weaver Detachable Ring. Custom hardened fastening screws come with every Weaver base. No.61 mount Note: This is only a single mount. Fits: Anschutz 1568, rear CIL 950 and 950-C, rear Ithaca LSA-55 and LSA-65, front or rear Modern Muzzleloader Knight MK-85 and KB-92, front or rear Modern Muzzleloader T-Bolt flat receiver, front or rear Sako Whitetail Hunter, front or rear Savage Pre-2003 10, 12, 16, 510, 512 and 516 short action, rear Savage Striker pistol, rear Savage 110 E/S, 111, 112 R/V/FV and 116FSS long action, rear Savage 210 shotgun made before 2003, rear Savage 10 muzzleloader, rear Shilen flat top receiver, front or rear Stevens 110E, rear Tikka flat receiver, front or rear