The Morse M34 A1 Arbor is designed for use with hole saws ranging from 14mm to 30mm in diameter. It comes with a high-speed steel (HSS) pilot drill and features a 3/8" hex shank for secure fit and easy changes. Size Range : Suits hole saws with diameters from 14mm to 30mm Shank Type : 3/8" Hex Shank Included : Supplied with HSS pilot drill Features : Secure, easy fit with 3/8" hex shank Compatible with a range of hole saw sizes Brand : Morse