This Bostitch Industrial 16 Gauge 1-1/2" x 1" Wide Crown Pneumatic Roofing Stapler (438S2R-1) has a lightweight, durable aluminum frame and a patented jam-free magazine. The power control valve adjusts power by 30%. A molded rubber grip enhances your comfort and lasts for the life of the tool. The reduced height makes it easier to staple in tight areas. Adjustable depth control prevents over-penetration of staple. A rear exhaust conveniently directs exhaust away from you and the work surface. The high capacity, top load magazine decreases reload time for increased productivity.