... is above 50HRC.For drilling in soft and close grained wood, chipboard and floor boardStandard qualitySpecial 1/4" hex shank ... out.For drilling accurate, splinter-free holes in soft wood, hard wood, plywood and hardboard.Diameter: 3 -26mm (1/8" -1") ... polished.For drilling accurate, splinter-free holes in soft wood, hardwood, plywood and hardboard.Professional type, long lifetime, fast drillingSize: 3 ...