18-piece wood twist drill bit and bit set. High quality, metal twist drill bits for precise, splinter-free drilling in soft wood, hard wood and laminated panel material. Made out of high speed steel (HSS). A finely-tuned material elasticity provides for great durability. Very good concentricity. The hexagonal shaft ensures very good power transfer. The Rapidaptor universal holder ensures rapid bit change without any extra tools. Drive: 1/4in hexagon, suitable for holders with take-up as per DIN ISO 1173-D 6.3.