From stainless steel, very elegant, and even more secure: the deployant clasp from NOMOS Glashütte. Your retailer can attach this NOMOS deployant clasp onto your strap in a moment. With a little finesse and two screwdrivers with a 1.6 mm wide blade, you can also do it yourself—find out more here. Please check every so often whether the screws of your deployant clasp are still sitting tight—and readjust them if required. To be on the safe side, you can use a drop of screw lock lacquer on the head of the screw before tightening.