The Pin buckle / Tang buckle is the oldest and most widespread type of watch strap closure. It works on the same principle as a classic belt: a metal pin (the tang) passes through one of the holes in the bracelet/strap and fits into the buckle frame, holding everything closed through friction and gravity. Simple, lightweight, and reliable, it adapts to any type of strap — leather, rubber, textile — and is available in all materials: steel inoxidisable (stainless), gold, titanium, ceramics. Its drawbacks lie in the progressive wear of the bracelet’s holes and in the fact that it does not offer infinite regulation/timing. The Pin buckle / Tang buckle coexists today with the Deployment buckle, better suited to metal bracelets.