1 4'' hex shank for quick bit changes. Compact ergonomic shape fits like a glove with even pressure and easy control. Variable speed 0 to 2400 RPM and 800 in. lb. of torque. This impact driver has a 13 16'' capacity in wood and 3 8'' capacity in steel. Weighs just 2.2 lb. Built in LED light illuminates the work area. 50 minute Energy Star rated charger allows for more work. Includes (2) 10.8V batteries, charger, and case. 3 year warranty on tool and 1 year warranty on battery and charger.