This Matco air impact gun is a powerful tool with a 1/2in. drive size and a maximum torque of 1700. It comes with a protective cover accessory and has no warranty. The manufacturer part number is 6hz201916. This is a single item, perfect for those in need of a reliable and sturdy air tool for their automotive needs. Slashed the price down 75 dollars .I paid 600 hundred for it. New .only slightly been used in great condition.