These aluminum alloy rods from SmallRig provide a mounting option for matte boxes, followfocus setups, and more.

2pcs 15mm Black Aluminum Alloy Rod(M12-30cm) 12inch 1053 could be utilized for mounting various 15mm-compatible accessories to the camera rig with inner M12 thread at ends.

The rods are made of aluminum alloy, and they have good abradability and anti-causticity, but much brighter and stronger than the original industry standard rods.