The Leupold QRW bases are a great way to upgrade your existing aluminum Weaver style bases with steel. These cross slot bases are becoming one of the most popular styles available. Paired up with the PRW or QRW rings, or the Burris signature series rings, they're guaranteed to give you a rock solid scope mount. All bases feature Torx drive screws and include a Torx wrench. Mfg: Leupold SPECS: Steel, powder-coated finish. Available in Matte Black (MB). Bases sold in pairs.