The QRW2 Rings are part of Leupold's Cross-Slot Mounting Series, making them compatible with both Picatinny and Weaver style rails. Available in 1-inch, 30mm, and 34mm diameters, the QRW2 Rings offer a traditional look and are ideal for standard to magnum calibers. In addition, the QRW2 Rings are precision machined from solid steel and are every bit as rugged and dependable as Leupold’s premium optics. Features: Available in 1-inch, 30mm, and 34mm diameters Precision machined from solid steel Ideal for standard to magnum calibers Leupold QRW2 30mm High Glossy Quick-Release Weaver-Style Scope Rings 174077