Mount Diameter: Vortex Sport Cantilever Picatinny Mount is available with 30mm diameter Offset: It has a 2-inch offset that gets your head position and eye relief dialed, while leaving plenty of real estate on your rail Lightweight Design: Lightweight, but with the power to stand up to recoil and the rigors of range day, these mounts get you firing faster and easier, with performance you can believe in One-Tool Mounting: The 6061-aluminum mount has a commonality between fasteners and components for one-tool mounting Finish: It has a type 2 low-glare matte black anodized finish