Ultimate Arms Gear Tactical Machined Aluminum Rail Mini Compact See Through High Profile 1" 3 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: 1.7"(3 Slots) x Width: 1.1" x Height: 1.25" (rise height 1.0"); Weight: 1.1 oz