Lightweighted aluminium component , effectively shades the light and prevents lens reflection and vignetting. Square lens shade cover，suitable for 37/39/40.5/46/43/49mm lens Easy installs and remove, provides good light blocking effect. for photography enthusiasts, professional photographers and photography students who need to protect their lens and improve the of their photos. for outdoor photography under strong light environment, landscape photography, portrait photography and other scene that need to avoid light interferences.