Ramset 40066 Hammer Tool    Use the trigger shot tool for fastening to concrete, masonry and steel. Easy-to-use and great for wall applications and between studs. The positive barrel and load retention will prevent the barrel from opening freely, allowing for easy overhead and horizontal fastening. Uses the 0.22 caliber "Ramset" loads. After each use the power load will automatically eject, allowing you to quickly complete your jobs.