Bosch HDS181-02 18V Compact Tough Hammer Drill Driver 4-pole high performance motor provides maximum power in a compact size New patented gear train and clutch enables compact design and light weight Flexible power system, both DD and HDD are compatible with every 18v Li-Ion Bosch battery Ergonomic grip zone enables better gripping and greater comfort Ergonomic design provides modified orientation relative to handle, increases comfort