The Bosch ADS181-102 features a High Performance Motor - Produces best-in-class torque to complete demanding applications. Currently if you purchase ADS181-102 you will receive an additional Free Bosch High Capacity 18-Volt Lithium-Ion Slim-Pack Battery (BAT609) (Online Only). High Performance Motor - For increased performance, longer life and higher stall torque. All Metal Gearboxes - For maximum durability and increased performance. Auto Lock 1/2 in. Ratcheting Chuck - Maximum range of applications from drilling to driving. Compact Head Length for drilling and driving in tight places.