Mount accessories like a viewfinder, an EVF support bracket, a monitor, or a small light on your tripod fluid head with the ARRI 3/8"-16" Accessory Mounting Block & Bracket from Miller. Compatible with ArtX, CX, and Compass heads, this block includes a bracket assembly (#12715). It attaches to either side of your fluid head, enabling you to mount up to 6.6 lb of accessories. It features one ARRI anti-twist 3/8"-16 thread, one 3/8"-16 thread, and one 1/4"-20 thread.