Powers Fastening Innovations 52010 P3600 Deluxe Powder Tool Kit, 1 Per Box The P3600 is a powerful heavy duty low velocity, semi-automatic .27 caliber tool Used to install 10 millimeter head drive pins, 3/8-inch threaded studs and 3/8-inch headed drive pins Powers Fastening Innovations Designed for applications where more power is needed, such as attaching 2X4s to hard aggregate or steel