Flat 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 an aluminum holder with (2) 7/32" dia mounting holes and a 1/8" female NPT inlet to attach directly to a supply line.  The bristles are stainless steel (nylon is also available, see part no. A2258-1X02).  A replacement brush that slides into the holder is readily available.