It is suitable for use with all corded and cordless drill drivers. The Hexagon Adapter connects the hole saw to the power tool with a mandrel. Hex adapter with 1/2"-20UNF thread and HSS-G pilot drill bit (2 608 596 295) Width across flats 1/4" (6.35 mm), for diameter 14 mm, 9/16" - diameter 30 mm, 1 3/16" • Use of Holesaws on Power Tools with a Mandrel • Hexagon Adapter connects the hole saw to the power tool • Suitable for use with all corded and cordless drill drivers