Hawke Match Ring Mounts 2 Piece 30mm MediumHawke Match Ring Mounts Double hex screws to hold your scope firmly in place Internal cushion tape prevents marking and damage High grade aluminium anodised in matte black Configuration: 2 Piece Ring Size (Diameter): 30mm Height: High Medium Fixings (Rail & Top Cap): Double Hex Screw Internal Cushion: Yes Retractable 'Recoil Stop' Pin: yes Height: 30mm Reversable Clamp rail accordingly for either 9 11m airgun or 3 8" rimfire