Fangrui Product Details Its Very Comfortable To On The Button. The Button And Edge Are Very Smooth. Its Polished And Enamel Painted. The Screw Thread Is Carefully Designed And Tested. It Fits The Cameras With Screw Hole On The Shutter Release Button Such As M Rangefinder Cameras Include Film M3 M6 Mp, Digital M8 M9 M9p Etc.; Slr Cameras Like Most For , For , For , For , For , For Rolleiflex, For X100 Slr Cameras. Material:aluminum Color:silver, Black, Gold And Red Shape:concave Size:10mm (diameter) Package Contains:4pcs Concave Release Button Note: Light And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.