Each Weaver base is machined to tight tolerances for a custom fit. These Aluminum bases offer maximum strength for rings to hold tight. Fits the following models: Anschutz 1568 | Beretta Mato Rifle (Front) | Browning Models BLT, ACT, Hi Power, BBR LA/SA | CIL Models 950, 950C, & 972C | Colt 57 | Cooey 71 | H & R Models 300, 301LA, 330, & 370 | Herters J9 | High-Standard High-Power | Marlin 455 | Mauser Models 95, 98, 99, FN, ZB, & Bauer 3000/4000 | Musgrave Models Mark I-IV | Parker-Hale Models 1000, 1000C, 1100, 1200, & 1700 | Savage Models 110, 110E, 110S, 111, 112R, 112V, 112FV, & 116FSS | Sears Models 50, 51, 51L, & 53 | Stevens 110E | Voere Models 2150 and 2165/ 1-4 | Weatherby Models Mark 5 & FN | Winchester Models 52 (Hole spacing the same, fits rear and front), 54, 70LA/SA, 670, 770.