Bottom side ARS-3 showing
3/8-16 screw and two locating pins.

ARRI’s Accessory Rail System ARS consists of Rails that attach to camera or mattebox, and Cubes that slide onto the rails and provide  3/8-16 and 1/4-20 mounting points for accessories, monitors, motor drivers, video transmitters, focus aids and whatever else you need to attach to the growing Christmas tree that is the camera.

ARS Cube Set Pro consists of ARS-1, ARS-2 and ARS-3.

Cube Set Pro combines three Accessory Rail lengths: ARS-1 (30 mm / 1.18″), ARS-2 (60 mm / 2.3″), ARS-3 (90 mm / 3.5″) and three ARC-1 Accessory Rail Cubes. The Cube is secured with a locking lever. The Rail attaches with two locating pins and a  3/8-16 screw that nicely accepts 4 different sized hex drivers: 3, 4, 5 mm or 5/32″. Spring-loaded ball bearings on top act as end stops for the Cube.

(This is a “reprint” from August 2020 FDTimes issue 104.)