Wood twist drill series 3500 (CV) with mounted countersink series 2100 (WS), incl. hexagon key, drilling and countersinking in one operation, well suited for softwood and to a limited extent for European hardwood, for hardwood we recommend the wood twist drill 1594 (HSS-G) and countersink VARIO 2202, place depth setting ring 2108.206 directly on countersink and set countersink depth