NEO TOOLS bi-metal hole saw adapter 14-30 mm 57-938 is a bi-metal hole saw adapter designed to work in the 14-30 mm diameter range. Made from HSS steel, it provides high wear resistance and stability for working in a variety of materials. Application: metal, steel, stainless steel, aluminium, copper, wood and plastics. The design of the NEO TOOLS adapter enables secure seating of the hole saw and effective torque transfer.