M18 compact hammer drill's digital power management--overload protection prevents damage to tool and battery in abusive situationsM18 impact driver utilizes a 1/4-inch hex quick-change chuck for easy bit changes and a variable-speed triggerBoth tools use a built-in LED light to illuminate work surfacesA 1/4-inch hex quick-change chuck allows for easy bit changes while a variable-speed trigger provides increased user controlThe driver offers 0-3,200 IPM, providing more impacts for increased productivity