The Mac Tools AD540 3/8" Pneumatic Reversible Air Drill is a high-quality single item tool designed for automotive use. It features a 3/8" chuck size, 1/4" air inlet size, and comes with a chuck key for easy operation. The pistol grip design offers a comfortable grip for extended use, while the reversible feature allows for versatility in various tasks. With free shipping included, this air drill is a convenient and reliable addition to any mechanic's toolbox.