Cordless Screwdriver DFR550RFE More reliable sturdy aluminum casing attachment • Stopper base provides anti-tilt device for preventing screws from swaying. • Silent clutch features high durability. • Screw guide designed to prevent collated screw strip from getting tangled. • Reverse switch operable by one hand. Capacity               Drywall screw : 4x25 - 55mm(5/32"x1" - 2-3/16") Bit size  Hex Shank : 6.35mm(1/4") No Load Speed (RPM)    4,000 Dimensions (L x W x H)  424x80x238mm(16-3/4"x3-1/8"x9-3/8") Net weight          2.1kg