4-screw Low Profile "Tiger" Ring, hined From Aircraft Aluminum Alloy with Maximum Strength * 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