Ultimate Arms Gear Tactical Machined Aluminum Rail Mini Compact See Through Low Profile 0.5" 2 Slot Riser Mount Compact, Picatinny mini-riser is perfect for raising lasers, lights, sights, and other essential accessories that need a little extra lift or clearance Constructed of aircraft-grade aluminum and hardcoat anodized for durability and long-lasting resistance to surface wear. Milled out center for see through ability to maintain use of iron sights & weight reduction. Fits 7/8" Weaver/Picatinny rail systems; thumb cap screw clamps riser securely to rail. Length: 1.25"(2 Slots) x Width: 1" x Height: 0.7" (rise height 0.5") ; Weight: 1 oz