Neewer 10MM Diameter Black Concave Camera Shutter Release Button for Leica M Rangefinder Cameras (such as M3 MP M9 M9P) FUJIX100 Nikon Canon Hasselblad Olympus Minolta Rolleiflex SLR Cameras With Screw hole Color: Black Shape: concave Size: About 10mm (diameter) This Soft Release Button for all the Camera with the tapered thread mouth.