Bosch 8 piece robust line brad point drill bit set for wood all brad point drill bits are manufactured to strict bosch factory standards extremely sharp drill bits for precise tear free drilled holes precision ground with cbn grinding process and cubic crystalline boron nitride grinding disc into fully hardened material brad point drill bits for rapid drilling up to 30 mm diameter also with a cordless drillhard and soft wood drill bit with centring tip and shoulder cutter drill bit colour black