Lion Gears Tactical Picatinny/Weaver 1" Slim Riser Bridge Mount BM1210, 5" Long 12 Slots Lion Gears BridgeMount BM1210 Riser Robust and Light Weight Design with Steel-to-Steel Connection between Screw and Locking Nut Plate. See-Tru Design with Picatinny Mounting Base. 12 Slots 5" Long 1" Riser Precision Machined Solid Aircraft Aluminum with Hard Anodizing for Tight Tolerance and Durability.