For use with Bi-Metal Holesaws. The Hexagon Adapter for Holesaw diameters from 14mm to 30mm, connects the Holesaw to the power tool with an arbor. It has a 1/2" thread and is fitted with a HSS-G pilot drill. It is suitable for use with all corded and cordless drill drivers. Technical Specifications: For Diameter Holesaw mm: 14 - 30mm. Shank Size: 9.5mm. Shank Type: Hex.