The strong, streamlined Vortex Optics HS-30L-QR Quick-Release Riflescope Rings use a unique lever system that allows you to remove and reattach the scope from rifle without loss of zero. Four T-15 Torx style socket cap screws securely mount your riflescope. Once the rings are affixed to the base, the location of the lever can be indexed. After tightening the lever, simply pull it out, turn it to the desired location and let it snap into place. The stainless steel recoil control key in both the front and rear rings ensures a no-slip positive recoil surface that withstands the heaviest of recoil.