15-19mm Bars are an alternative to standard 15mm bars and eliminate the use of slip-inducing 15-19mm collars when mounting lens motors.
These are available with the 19mm end either bored out, or with a 3/8″ UNC female thread allowing the bar to be extended.
The most common size ordered is a bar with 3in of 15mm diameter, and 4in of 19mm diameter.
Custom sizes are available. Price is per bar.