The Burris BTC Thermal Clip On Adapter allows you to quickly mount the BTC clip on to your favorite riflescope. The Thermal Clip On Adapter simply screws on your BTC and secure to your optic's objective lens using a quick-detach lever. - Features - Quickly mount the BTC to your favorite riflescope - Screw into the BTC and secure to your optic's objective lens - Quick-detach lever