The W040 is light weight and compact for easy access in confined spaces. Patent-pending IQV technology provides maximum performance, durability, and battery life.The W040 is compatible with Lithium-Ion 7.2V IQV batteries. Ideal for automotive interior, engine service, autobody service, and non-critical assembly applications where small size and light weight are key. Features: 40 ft-lbs max reverse torque, reverse-bias torque to prevent stripping small or plastic fasteners, all metal hammer case and housing ring for ultimate durability. Tool Only. 7.2V Lithium-Ion Battery and Charger Sold Separate.