DNZ Hunt Masters 2-Piece Tactical Scope Mount LH/RH 4 Screws - Browning A Bolt Sako A7 Steyr LA / 1" Medium Black Base screws are 6-48 X 1/4" long. Ring screws are 6-40 X 5/8" long. Both use a 7/64 Allen wrench. Hole spacing dimensions on front mount and back mount are .86". Both mounts are the same part. Standard rings are .63" wide and Tactical rings are .80" wide. Standard rings have 2 screws per ring and Tactical rings have 4 screws per ring. Height of mounts from top of receiver to centerline of scope tube is " low .94" medium 1.06" and High 1.19". Specifications: - Type: Tactical Scope Mount - Pieces: 2-Piece - Fits: Browning A Bolt Sako A7 Steyr, Long and Short Action Guns - Height: Medium - Scope Tube Size: 1" - Color: Black - Hand: Left or Right Hand - Includes: 4 Screws Per Ring