This is a 9 piece holesaw kit. This kit is brand new in the factory box. These are BI-METAL H.S.S. holesaws, which mean they will cut any type of wood or metal. This kit is known as the "electricians kit" besacuse it contains many popular sizes which contractors, espeically electricians, will use. You get six different holesaws: 7/8", 1", 1 1/4", 1 3/8", 1 3/4", and 2 1/8". You also get the standard mandrel and the hex quick change mandrel. The pilot starter bit is included. The entire set comes in a heavy duty ABS plastic carrying case.