The Snap-On IM31 3/8" Drive Air Impact Wrench is a high-quality pneumatic tool designed for automotive use. With a durable construction and reliable performance, this unit features a 1/4-inch air inlet size and a single item set. The manufacturer part number is IM31, making it easy to identify and replace if needed. This impact wrench is a valuable addition to any automotive tool collection, offering the strength and precision needed for various mechanical tasks.