Overhead fastening applications are a breeze when you've got the Ramset 27 Caliber Powder Actuated Tool (VIPER4). It screws securely into the end of the extension pole with the steel collar ensuring a more durable and rigid connection. It has a heavy duty buffer system that prevents front end damage caused by piston overdrive, especially through sprayed-on insulation. The completely redesigned open-ended muzzle keeps it cleaner long. Plus, the simplified barrel retention collar requires no tools for assembly or disassembly.