The DeWalt DCK267M2 20V MAX* XR Drywall Screwgun & Impact Driver Kit (4.0Ah) features DeWalt built brushless motors in both units that delivers maximum run time, and run on XR Li-Ion batteries (with fuel gauge) which provide 33% more capacity over standard packs. The Impact Driver has one-handed loading 1/4" hex chuck accepts 1" bit tips It is has a compact (5.55" front to back) and lightweight (2.9 lbs) design to fit into tight areas. 3-speed settings on the impact driver offer optimized application versatility, with Precision Drive in Speed 1 for precision applications and added control. The Screwgun has up to 4,400 rpm which provides greater speed than the DW272 corded screwgun. The screwgun is also balanced and ergonomic. Belt hook included on both units for portability as well as LEDs for increased visibility.