Detail Information: 4-screw High Profile "Tiger" Ring Machined from Aircraft Aluminum Alloy with Heavy Duty Steel Locking Plate for Maximum Strength Holding Zero Twist Lock Design for Quick and User Friendly Easy Installation Light Weight with See-through Tunnel and Slot Cut on Ring Top High Quality Synthetic Protective Tape on Rings' Inner Surface to Protect Your Equipment Optimized Dimensions for Best Fit on All Picatinny/Weaver Rails Strong Recoil Stop Cross Bolt for Optimized Fit and Zero