The Leupold 180956 is a BackCountry cross-slot base system, masterfully machined from 7075-T6 aircraft-grade aluminum. This ensures both exceptional lightness and toughness for superior performance. Importantly, it is compatible with both Picatinny and Weaver-style rings.Leupold\'s 2-Piece Backcountry Scope Mounts with Integral Rings are built with the same lightweight and rugged 7075 aluminum. These cutting-edge, precision-machined mounts blend the traditional base and the ring to fit seamlessly onto the rifle receiver. This sleek, effortless-to-install mounting system ensures utmost stability. The finish is matte black, giving it a professional and sleek look. The material used is robust Aluminum, with a medium height. The style adopted here is that of integral scope rings and it is available in 2 pieces with a tube diameter of 1 inch.