Triple torx screws to hold your scope firmly in place Crossbar for additional security Internal cushion tape prevents marking and damage High grade aluminium anodized in matte black 1in 2 Piece Weaver Medium Configuration: 2 Piece Ring Size (Diameter): 1.2 / 30mm Height: Medium Rail: Weaver Fixings (Top Cap): Triple Torx Screw Fixings (Rail): Hex Thumb-Screw Internal Cushion: YES Height: 49mm / 1.9 Weight: 142g / 5oz 1in 2 Piece Weaver High Configuration: 2 Piece Ring Size (Diameter): 1.2 / 30mm Height: High Rail: Weaver Fixings (Top Cap): Triple Torx Screw Fixings (Rail): Hex Thumb-Screw Internal Cushion: YES Retractable 'Recoil Stop' Pin: NO Height: 55mm / 2.2 Weight: 154g / 5.4oz 1in 2 Piece Weaver Extra High Configuration: 2 PieceRing Size (Diameter): 1.2 / 30mm Height: Extra High Rail: Weaver Fixings (Top Cap): Triple Torx Screw Fixings (Rail): Hex Thumb-Screw Internal Cushion: YES Height: 61mm / 2.4 Weight: 164g / 5.8oz