This one-piece aluminum base is machined to tight tolerances for a custom fit.It offers maximum strength for rings to hold tight.Screws are included.Fits anschutz 1568; browning bolt action bbr, hi-power, other caliber (older mod); churchill 950, 950c, 972c; colt 57; cooey 71; enfield w/receiver cut down like win 70; h&r 300, 301, 330 & 370 (pre 1973); marlin 455, mr7; mauser; ruger american; savage a17, axis, series, edge; win 52.Type: 1-Piece BaseModel: Top MountStyle: Top MountMisc: N/AFinish: BlackMaterial: AluminumPieces: 1Gun Type: RifleRings Included: No