"X" marks the spot. Weaver styling combined with the X-Lock's four-screws-per-base design gives you a rock solid foundation for your scope. Lightweight, strong and solid. Most people consider Weaver style bases the industry standard for hunting rifles. Made from high-quality aircraft grade alloy, these bases will work with Browning rings, or just about any other Weaver-style rings you want to mount on them. Features: Browning 2-piece Weaver-style scope bases are machined from aircraft grade alloyX-Bolt bases feature a four screw per base mounting platform for a secure fitLightweight, strong and solid