Soft Metal Shutter Release Button with 11mm (Diameter) Concave Surface (Rubber O-Ring Included) The 11mm concave surface soft release buttons are made of brass and ensure a comfortable finger touch at the top of your camera. Easy to use, just screw the soft release button into the threaded shutter release socket on your camera and enjoy the soft and steady shutter release operation. Also works as a stylish and elegant decoration for your camera. Rubber O-rings are included, which are mainly used for Fujifilm X series cameras to ensure a tight attachment, while they are not used for Sony RX1 & RX10 series cameras. Other brand cameras do not need the rubber O-ring, you can add a small piece Teflon Thread Seal Tape on the button screw, it will stay firmly on the camera.(not included in the package) Concave surface diameter: 11mm. Thread size: ¼ in. Available in 10 colors: Red, Black, Silver Gray, Silver, Gold, Dark Red, Orange, White, Green, Yellow.Compatible cameras: Fujifilm: X-T3 / X-T2 / X-T20 / X-T10 / X-PRO2 / X-PRO1 / X100F / X100T / X100S / X100 / X30 / X20 / X10 / X-E3 / X-E2S / X-E2 / X-E1 / STX-2 Leica: M10 / M9 / M8 / M7 / M6 / M3 / M2 / M1 / M-E / M-P / M9-P / M-A / M-Monochrom / M Type 240 Canon: New F-1 / F-1 / AE-1 (FD mount) Nikon: Df / M2 / F3 Sony: DSC-RX1R II / DSC-RX10 IV / DSC-RX10 III / DSC-RX10 II / DSC-RX10 Other Brands: Minolta XD7 / Minolta SR-7 / Rollei (LM mount) / Olympus OM-1 / Hasselblad 503CWNote:It also fits other cameras with a standard threaded shutter release socket which is designed by the camera manufacturers to accept a mechanical shutter release cable.