Return to Zero Guaranteed, quickly detach and reattach the rings with no loss of zero. CZ specific recoil pin for positive engagement of ring to receiver dovetail. Rings securely mount around scope using 4 Torx style T-15 socket cap screws, 25 in/lb. of torque recommended. Since each firearm manufacturer has their own proprietary mounting rail design, each ring model must be machined to exacting tolerances for proper fit and function. Because of this, the Warne CZ Rings are able to fit right onto the receivers dovetail with no need for a mounting base. The CZ Quick Detach Rings sport the unique Warne indexable lever system which allows the user to remove the optics from the rifle then reattach it without the loss of zero, as well as allowing the location of the lever to be indexed once the rings are affixed to the bases. After the levers are tightened, simply pull out on the lever, turn it to the desired location then let it snap into place.