Brushless motor and two 18 V 4.0 Ah batteries for more endurance, longer life and more compact design. All 18 V batteries are compatible with new and existing CAT Professional tools of the same voltage class 4 function in 1 battery hammer drill: drill, hammer drill, bit rotation, chisel, with electronic overload protection and anti-vibration design as well as bright LED light Drilling capacity: wood 32 mm, metal 13 mm, concrete 26 mm, forward and reverse rotation, variable speed with reverse gear, 0-1210 / min. Idle speed, impact energy: 2.2J Universal SDS-plus tool holder with automatic closure; SDS-plus drill chuck allows the drill bits to be changed without tools and quickly Package list: 1-piece CAT DX21 brushless battery hammer drill, 2-piece 4.0 Ah Li-ion battery, 1-piece 4A charger, 1-piece additional handle, 1-piece depth gauge