The hitachi wr18dsdl impact wrench is a heavy duty impact wrench with high capacity 50ah li ion batteries that have double the performance of a 30ah li ion batteries the lightweight slide on batteries have a multiplex protection circuit for maximum battery life and are the same size and weight as 30ah40ah li ion battery the impact wrench has a high tightening torque of 255nm hard with a power mode for heavy duty work and a safe mode for smaller jobs 140nm it has a slimline soft grip handle with