The Stanley IW16 is a heavy duty 1" square drive impact wrench designed for the toughest underwater bolting applications. Powered by a Stanley integral Hyrevz motor, the IW16 has a durable swing hammer impact mechanism with adjustable impact intensity from 500 to 2500 ft lbs (680 to 3400 Nm) of torque. Designed to run from a wide range of hydraulic circuits. "D" style grip handle with multi-position assist handle and hi-visibility yellow paint is standard.