Michael writes in and shares a clever and affordable set of rails that make mounting accessories to your rig a whole lot easier. Threaded mounts are available across the rod for adding ball heads, friction arms, cold shoe adapters, etc.
Despite having threaded mounts running across most of the rail, these rods maintain an OD (outside diameter) of 15mm throughout. This means that you can continue to use a follow focus, mattebox, or anything else with a 15mm clamp on any part of the rail without compromise.
Available in either a 6" single 15mm rail, 6" dual 15mm rails, or a rail kit with an extension adapter to stack them together for longer lengths (found here)
15mm Cheese Rod Rails for Video Rigs