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 Ruger Rings are able to fit right onto the receiver's dovetail with no need for a mounting base. - The Ruger Quick Detach Rings are available in two different styles to fit either the Ruger #1 receiver design (which includes the Blackhawk and Mini 14 models) or to fit the tapered receiver style like the Ruger M77 Hawkeye & Super Redhawk. The Ruger M77 style rings are packaged as two different heights to accommodate the tapered mounting surface on this firearm. These 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. - Return to Zero Guaranteed quickly detach and reattach the Ruger QD rings with no loss of zero. - Indexable lever allows placement of the levers in any position desired. - Ruger specific scalloped recoil control key 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.