1) These lens hood made of metal and with Hollow-out design, nice and practical 2) Fits for leica 52mm lens and any standard lens with 52mm Filter Size 3) Lock on to the lens directly with a screw-in type. 4) Prevent unwanted light or glare entering your lens when taking pictures. 5) Give your pictures better contrast and better picture quality.

http://olla.gr/52mm-metal-vented-lens-hood-for-leica-black/