Bosch Professional Impact Control 8-piece HSS drill bit set Special characteristics VERY ROBUST FOR IMPACT DRIVERS Very robust Impact Control HSS twist drill bit for drilling in metal, especially with impact drivers Precision-ground from solid metal with an oxide-coated flute for low-wear drilling in materials Drill bit manufactured according to DIN 338 of type N (flute angle) with a 135-degree point and diameter tolerance of h8. Active drilling and perfect centering. 1/4 inch hex shank for universal use Technical data Diameter: 2 / 3 / 4 / 0 / 0 / 7 / 8 / 10 mm Total length: 60 / 72 / 83 / 91 / 98 / 109 / 117 / 133 mm Set dimensions: 22 x 115 x 235 mm