Streamlined, strong and durable, the Viper rings use four T-15 Torx style socket cap screws for secure mounting of your riflescope. Unique design permits easy installation and removal of the scope into/out of the rings KEY FEATURES: Precision CNC machined from high strength 6061-T6 aluminum alloy. Quickly detaches from base. Square-edged crossbolt ensures positive engagement of ring to base. Durable black matte anodized finish. Made in USA.