Lion Gears Tactical Extended Long Rail Cantilever Mount 0.5" Riser with 25 Slots BM2505EX Extended Slim Low Profile Long Rails for Multi Items Mounting Soluctions. Perfect to Mount Dot Sight with Magnifier Purpose. Low Profile 0.5" high, 10" long, 25 slots with 5 7/8" overhang, 80mm Mounting Slots Spacing Rock Solid Design with Steel to Steel Locking Screw & Nuts; Not Those Bolted into Aluminum Where Trouble Bounded to Happen Sooner or Later! Modular Design with Under Bridge Space for Mounting Additional Accessories Light Weight Slim Design at 4oz