Roto Shank Brushes are used to apply lubricant to chains and other moving surfaces.  The wisking action of the bristles evenly distributes the fluid as it reaches the contact surface.  Brushes can also help prevent dirt build up.  Bristles are available in nylon or stainless steel.  Roto brushes have a plated steel bracket to attach to a mounting shank or directly to a supply line.  The replacement brush is available without mounting hardware.