CCOP Two Piece Steel Base Rifle Scope Mount for Winchester 70 Pre 64This rifle scope steel base is precision machined from bars of solid steel, making it strong enough to take the recoil of any caliber. Each base is exquisitely styled and perfectly suited to the task at hand. Package includes torx screws and wrench for no-strip, easy installation. Material: Steel length: 40 mm Radius: 33.78 mm Height: 7.95 mm Screws per Unit: 2Usage for: Winchester 70 (Rear Hole Spacing.860) L/A & S/A, Browning BBR L/A & S/A.