The snap button in 15mm. The snap fastener made of steel , brass , stainless steel . The durable metal button . The metal fastener used on garment / leather / medical health care equipment . The custom-made ring snap button . The ring snap fastener with the high strength . The metal button made through the precision manufacture & the stringent quality control . The screw fastener comes in colors of nickel plated , black nickel plated , the anti-brass plated , bronze plated , the anti-black plated , the anti-copper plated , zinc plated , ... etc , so does the coating . The medical fastener comes into spring type & the magnetic type . Easy Snap ! User Friendly !