Lion Gears Tactical Low Profile Picatinny/Weaver 0.5" Slim Riser Bridge Mount BM1205, 5" Length 12 Slots. Perfect to Setup Reflex Sight or Open Sight with Bridge Over AR Delta Ring Tactical Picatinny Riser, .5" High, 5" Long with 12 Slots Modular Design with under Bridge Space for Mounting Additional Accessories Perfect to Setup Reflex Sight or Open Sight with Bridge Over AR Delta Ring Slim Design with Steel to Steel Locking Screw & Nuts. No Bulky Screws & Stripped Threads! Not Screwing into Aluminum where Trouble Bound to Happen Solid Construction & Truly Light, only 54g