Innovative Firing valve reduces air consumption without compromise on power or speed. Bi-Metal driver blade minimizes wear and improves durability. Wear Plates reduce shingle abrasion on tool. Thumbwheel adjustable depth-of-drive drives nails to a consistent and controllable depth. Full comfort grip reduces fatigue. Power In, Power Out feed System improves speed and delivers consistent drives. Adjustable Nail Canister, accommodates entire range of roofing nails. Canister metal wear plate reduces wear and helps improve nail feed. Adjustable and removable shingle guide for consistent shingle placement.