Yosoo Hunting Tactical Dovetail Picatinny Flat Top Adapter Extend Extened Weaver 20mm Scope Rail Riser Base Mount 1. Full metal construction, military style Non-reflective black matt, low weight and high strength 2. For Scope and Flashlight with 11mm weaver 3. Quick release nut allows instant attach & detach action, perfect for Hunting & Skirmish Play 4. See Through design allows you to aim with the Rifle's Iron Sight even with a Scope installed 5. 20mm Top picatinny/Weaver Rail allow installation of scope / sight / Red Dots Sight