SNIPERHigh Profile Compact 2-piece 1" Rings 4 Screw For Dovetail mount bases 3/8", 9mm to 15mm For 1" scope tubes. 2 rings included. High profile (1.29" ring center to base) 4 screws per ring. Holds zero. Includes stop pin. Aluminum alloy Reversible side plate for secure fit across variety of widths 1.29" / 33mm from center of ring to base