The 18V STANLEY® FATMAX® V20 Cordless Brushless Impact Driver with 1 x 4.0Ah Lithium Ion Battery and Kit Box features new and improved battery technology, with no memory effect and minimal self-discharge, coupled with brushless motor technology for improved power efficiency and run time. The Impact Driver features a powerful motor providing up to 2,800 RPM, 3,500 BPM and 170Nm of torque for efficient driving of large fasteners and other high torque applications. The Impact Driver is complete with a quick release chuck for easy bit changes to get the ideal drilling width for the job and an integral LED work light for improved visibility in all working conditions.Part of the new 18V STANLEY® FATMAX® V20 Cordless System – power all your V20 tools with a common new and improved 18V Lithium Ion battery to let you power through work with ease.