This Tenebraex objective flip cover provides protection to your lens and flips up out of the way when it is time to shoot and includes an adapter ring. Fits the Following Sig Sauer Scopes: Whiskey3 3-9 X40Whiskey3 4-12 X40Fits the Following Vortex Scopes: Crossfire II 3-9x40Diamondback Tactical 3-9x40Diamondback Tactical 4-12x40Viper 4-12x40Fits the Following Zeiss Scopes: Victory V8 1.1-8x30Victory V8 1.8-14x50Victory V8 2.8-20x56Other Fit: Trijicon AccuPower 3-9x40 Tenebraex Black Flip Cover w/ Adapter Ring UAC022-FCR