Primary Arms SLx Flip-To-Side Magnifier Mount Matte Black - One Piece. The Primary Arms SLx Flip-To-Side Magnifier Mount is designed to place your magnifier at 1.41 inches above the top of the picatinny rail. Additionally, it includes spacers allowing for a 1.535in and 1.64in centerline height, so you can easily line it up with your optic. It features a low profile design manufactured from 6061-T6 aluminum with two steel alloy crossbolts that apply up to 55 in-lbs or torque to ensure a rock solid mount. This magnifier mount also utilizes a direct bolt system to interface with the magnifier instead of a traditional ring design in order to save weight, increase strength, and eliminates the possibility of the magnifier slipping or twisting in the mount. Features: 6061-T6 Aluminum construction; Hardcoat anodized; Standard 1.41in optical centerline; Includes spacers for 1.535in and 1.64in heights; Compatible with direct bolt-on style magnifiers; Dual crossbolts made from steel alloy; Low profile and lightweight at 2.5 ounces;