The ‘Ratbar’ was the first Ratworks product.
A 19mm Screw in bar with a 3/8″ UNC male thread on one end, and a female thread on the other. This allows the bars to be extended, and for items such as cinetape horns to be mounted to the ends of them. The threaded end features a cross-drilled hole and two flats, that allow either a 4mm Allen key or spanner to be used to tighten them.
Primarily used to attach lens control motors to cameras to free up the lower 15mm & 19mm bars. They can also be used to rig items to the camera too and extend the Cube Bar.