This HSS holesaw set contains the 6 most frequently used holesaw sizes, along with 2 arbors and an adaptor. They will cut a wide variety of materials including wood, chipboard, plywood, plasterboard, non-laminated plastics and non-ferrous metals. The arbors have hexagon shanks for a secure grip in a power drill. These bi-metal holesaws are suitable for use in most variable speed power drills. The set comes in a sturdy zip-up case for safe and secure storage.