Simpson PT 27 Semi Auto Powder Actuated Tool .27 Caliber Fastening to Structural Steel MBHA Masonry Hangers The upcut spiral action combined The upcut spiral action combined with a 1 1 4" cutting height makes this bit well suited for through cuts in thicker stock where chip evacuation is critical reducing heat and keeping the cut path clear without repeated passes Designed specifically for use with Simpson Strong Tie adhesives this rod is engineered as a tension transfer element intended to work within Simpson Strong Tie adhesive anchoring systems Specifications Semi automatic and fast cycling reduces the time between shots so crews can maintain a steady work pace during high volume fastening tasks without stopping to manually advance loads