Snap-On, Cornwell & MAC 3/8" Drive Air Drills - Vintage, Pneumatic. Snap-On PD3 Vintage 3/8" Drive Air Drill, Cornwell CAT250 Vintage 3/8" Drive Air Drill, MAC AD540 Vintage 3/8" Drive Air Drill. LOT SIZE: 11x8x2" 8 LBS All information and photos are intended to be as accurate as possible, but errors are possible. No item may be returned or refused based on this information, which is provided as a service to bidders. Please read terms & conditions and ask questions before bidding.