Roto Brushes are used to apply lubricant to chains and other moving surfaces. The whisking action of the bristles evenly distributes the fluid as it reaches the contact surface.  Brushes can also help prevent dirt build up.

This Roto Brush features a plated steel holder with a 21/64" dia hole to attach to a mounting shank or directly to a supply line.  It is most commonly used as a replacemnt brush and holder for Roto Shank Brush models A2256, A2257, A2307 and Roto Valve Brush model A2261.  The bristles are nylon (stainless steel is also available, part no. A2307-6). 

The replacement brush is available without mounting hardware.