Leupold 49956 : Leupold\'s STD rings are precision engineered to match up with STD 1-piece or STD 2-piece bases. Rear ring is secured by windage adjustment screws.Leupold mounts are every bit as rugged and dependable as the Leupold optics theyre intended to secure. With a huge variety of mounting systems for nearly every type of firearm under the sun youre sure to find the perfect match for you firearm and your style of shooting. - Type : Ring Set - Size : 30mm - Height : Medium - Finish : Black - Tube Diameter : 30mm