DNZ Products (Dednutz) Game Reaper Browning 1" T Bolt Medium Black Rings Browning T Bolt: Base screws are 6-48 X 1/4? long and ring screws are 6-40 X 5/8? long. Both use 7/64 Allen wrench. Outside to outside of rings is 4.29?. Rings are .63? wide. 4 Hole to hole spacing dimensions are .50?, 2.87?, .50?. Height of mounts from top of receiver to centerline of scope tube is – low .94?, medium 1.06?, and high 1.19?. Mount fits both left and right hand firearms. Features: - Precision machined from a solid block of top-grade billet 6061T6 aluminum - Custom made to fit each type of firearm and align perfectly with your rifle receiver No moving parts between the firearm and the scope - 67% lighter than comparable one-piece mounts with four times the threads and precision socket-head cap screws for absolute strength and security - Absorbs shock and withstands temperature extremes better than steel mounts at a fraction of the weight - Made in the USA