This is a precision made anodized (blackened) aluminum screw-on camera lens hood for Rollei 35 series cameras. Its diameter is 30.5mm and fits all Rollei 40mm/f2.8 aperture lens including all Sonnar lenses. It does not fit for f3.5 Tessar lens. Please check my other listing for a hood for 3.5 aperture. Sold hundreds since 2011. Free shipping to all destinations by fast airmail. Please note that my Rollei 35 S camera shown in the photo is not included.