Tiny honeycomb baffles considerably decrease light reflection from objective lenses and won’t interfere with sight picture. Perfect for the shooter who wants to remain hidden and undetected. Easy-to-use design snaps snugly onto 40mm fixed objective, non-threaded scopes while front edge remains flush with the outside for a tight seal. Cleans effortlessly with water or blowing air. SPECS: Molded plastic, black. 1ѕ' (4.5cm) diameter, 9?16' (1.4cm) overall thickness. Fits non-threaded 40mm scopes with an inside objective diameter of 1.690 +/- .005' and a depth of .052-.108”.