Check the listing for details. Dual Ring Scope Mount 1inch /30mm Quick Release Cantilever Weaver Forward Reach. Color: Black, Condition: New. Listed at 17.99 USD. 1 inch/30mm Scope Rings Mounts Quick Release Cantilever Weaver Forward Reach Dual Ring Scope Mount Material: Aluminum Profile:High Profile Pieces:One piece mount Diameter 1: 30mm (1.2”) Diameter 2: 25.4mm (1”) Rail Type: 20 mm picatinny and weaver rails Inner space between the rings:55mm (2.16inch) 1inch / 30mm Forward reach 1 Piece Rifle Scope Mount Built in Weaver style rails - very handy fitting flashlights and lasers etc Quick release rifle scope rings 1 inch/30mm Quick Detach mounts allow you to swith scopes quickly with minimal loss of zero Mounts for all occasions with a wide variety of options that securely mount a riflescope onto any Weaver or Picatinny-style rail Heavy duty 6 holes scope mount Each ring use of 6 screws and Picatinny ring tops,Holds your scope securely without movement Muti-use scope mount Comes with 25.4mm（1in） reducer inserts so you can use this with 30mm and 25.4mm(1in) body tube rifle scopes See-thru scope mount See through scope mount sets the scope at the perfect height,you can see the rail sight easily through the bottom hole