Bosch 2609390034 HSS Bi-Metal Hex Shank Adapter  Hex adapter To connect holesaws to the power tools Insert the pilot drill bit, fix with Allen screw, screw in the thread, guide the pins into the holes, lock the cap with a screwdriver 5/8"-18UNF thread and HSS-G pilot drill bit (2 608 596 119) Width across flats 11 mm, for diameter 32 mm, 1 3/4" - diameter 210 mm, 8 9/32” Barcode: 3165140087780 Width across flats: 11mm For diameter: 32mm, 1 3/4" - diameter 210mm, 8 9/32" Total Shipping Weight: 1kg