Millett Aluminum Matte Angle-Loc Detachable Ring and Base Combo Pack for W-Inchter 70 Rifles The Angle-Loc clamping system provides a rock-solid mounting with normal finger pressure on the clamp cross-bolt Combo kit includes Angle-Loc aluminum detachable rings and a two-piece base Manufactured from lightweight 100-Percent aircraft quality aluminum Coin slots for easy removal and installation Precision fit base won't move under heavy pressure; mounting screws are stronger than traditional Weaver-style bases