The BLACK+DECKER A7186 drill bit set contains eight drill bits and seven screwdriver bits, plus a magnetic bit holder. The masonry drill bits are 5, 6 and 8 mm. The metal drill bits are 2, 4 and 6 mm. The brad point wood bits are 4 and 6 mm. The titanium drill bits provide a longer lasting performance. The screwdriver bits are 25 mm in length and cover all standard fittings. The magnetic bit holder makes screwdriving so much easier as the screw will stay on the drill bit, rather than needing to be held in place.