The Sioux SDR10P4N4 Palm Pistol Grip Air Pneumatic Drill is a high-quality 1/2" drill with a maximum speed of 400 RPM, perfect for various automotive and industrial tasks. Made in the United States, this single item set features a variable speed trigger for precise control. The keyed chuck size of 1/2" ensures secure bit retention, while the 1/4" air inlet size allows for efficient operation. Ideal for professionals seeking a reliable and durable air drill with a comfortable pistol grip design.