Flat Shank 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 Flat Brush features a mounting bracket with (2) 9/32" x 5/8" slots that allow for adjustability, and a 1/4" OD tube inlet to attach directly to a supply line.  The bristles are nylon (stainless steel is also available, see part number A2048-1X01). 

A replacement brush that slides ino the holder is readily available.