This Tenebraex Anti-Reflection Device provides a low-cost, retro-fittable, and field-practical way to hide reflection on optic surfaces with the use of a high-tech honeycomb material. Fits the Following Kahles Scopes: Helia 2-10x50iK312i 3-12x50K318i 3.5-18x50iFits the Following Sig Sauer Scopes: Tango4 6-24 x50Whiskey3 3-9 X50Whiskey3 4-12 X50 Tenebraex killflash ARD Flip Cover Compatible, fits 50mm Kahles K312i and K318i KH5052-ARD