Carbon Fiber Composite Hammer Tacker, 5/16" - 1/2"Carbon fiber composite structure for 45% less weight and 25% less muscle exertion 500k strike cycles Drop in loading for easy reloading of fasteners Auto lock, AntiJam pinch latch for reliable and easy operation Drives 5 16", 3 8", & 1 2" heavy duty staples Hammer style grip for comfort and ease of use Ergonomic design and vibration absorbing grip for improved comfort during prolonged use Staple Size: 5 16" 1 2" Manufacturer Part Number: DWHT75900