The Rimfire rings are designed to fit a very wide selection of rifles with either a 3/8 or 11mm dovetail. This is made possible by using a solid asymmetrical reversible clamp that can be flipped 180 and used on wider or narrower dovetails for the best fit. - All steel vertically spilt design that resembles the Maxima line of Rings. - Return to Zero Guaranteed quickly detach and reattach the Rimfire QD rings with no loss of zero. - Assymetrical reversible side clamp fits a 3/8 or 11mm dovetail. - Removable recoil key for the option to fit multiple firearm models. - Securely mounts to firearm with Torx style T-15 socket cap screws 25 in/lb. of torque recommended.