Lolumina 13MM Diameter Black Concave KN-CCV Soft-Release Button Complete Kit for Fujifilm X-T1 Sony A7 Complete Kit: Includes Soft-Release Button And Mounting Base.For cameras with NON-THREADED shutter release buttons Aerospace Grade Anodized Aluminum Soft-Release Button.T304 Stainless Steel Mounting Base Different Bases To Match Your Shutter-Release Button. Industrial Grade Adhesive Removable + Leaves No Residue. 13mm diameter.Concave Surface.Knurled Edges