BOSTITCH U/BRN175 Bulldog 15Degree Coil Roofing Nailer (Certified Refurbished) Selectable trigger allows the tool to be switched between contact and sequential firing modes Depth adjust wheel helps drive nails to the proper depth Adjustable exhaust directs the air away from the user Adjustable shingle guide for consistent shingle spacing Carbide nose inserts extend the life of the tool