MAX CN445R2 SuperRoofer Roofing Nailer Tar Resistant Nose (Patent Pending) The nose of the CN445R is designed to resist tar four times longer than conventional tools Maintenance free end cap filter (US Patent 5637125)captures dirt and sand down to microns Dial Adjustable Depth Control Dial depth control requires no special tools, providing accurate depth control MAX is known as the quality, durability and feature leader in the pneumatic tool manufacturing world