The SA Series features a compact carbon fiber tripod and a 30mm ball head. The clamp on the ball head features a 2-size clamp, which can accept both Arca standard plate and gun rail. The clamp system is designed for rapid lock of guns and it is with a 5mm diameter steel pin that engages 5.5mm diameter holes in the rail. In addition to supplementing the traditional friction-based clamping mechanism, the interface prevents unintentional
repositioning of the rail within the clamp when the Rapid-Lock is engaged.