Mount your flat-based ArrowFX fluid head onto a tripod with a 150mm bowl using this D150 Claw Ball Level Adapter from Miller. This durable metal alloy adapter attaches to the flat base of the ArrowFX head or other compatible head via three M5 threads or four 3/8" universal mounting holes. The adapter is secured onto the tripod using the long center screw and a D150 clamp assembly that tightens with a locking nut. The center screw is removable if you require a different screw length for your tripod.