Up To 60% More Power Die-Cast Aluminum Easy-Squeeze patented design Patented Drive Technology Ergonomic Grip Quick Bottom Load Precision Fastener Control resists jams Hi/Low power setting Shot Meter Uses 6 sizes of T50® Staples – 1/4" (6mm) - 9/16" (14mm) Uses 3 sizes of 18 gauge brad nails up to 1" (25mm)