Bosch RHS181K 18-Volt Lithium-Ion 1/2-inch Compact Rotary Hammer - Includes High Capacity Battery, Charger and Case Best-In-Class Compact Size - Shortest head length in its class, ideal for drilling in tight work areas Best-In-Class Light Weight - Lightest weight in its class, ideal for drilling over head Unbeatable Run Time: Over 100 holes (1/4-Inch x 1-1/2-Inch) per battery charge Compact Angle Gear and Pneumatic Hammer Mechanism - Bosch-engineered for long life and maximum performance Electronic Cell Protection (ECP) - Protects batteries from overload, overheat and self discharge