Selens Shutter Release Button Adapter for Leica,Rolleiflex,FujifilmX100,X100SX10,X20,xpro1,X-E1,Nikon,Canon,Hasselblad Diameter:9mm Shape:Convex Surface Our soft release buttons are shaped to nestle comfortably under the index finger first joint,enabling a softer shutter release and allowing lower shutter speeds without shake. Fits most shutter button with a threaded hole. The button is made of Metal,polished and enamel painted.It's very comfortable to press on the button. The button surface and edge are very smooth.