The BLACK+DECKER A7183 drill bit set contains 17 drill bits and 11 screwdriver bits, plus a magnetic bit holder and a countersink bit. The masonry drill bits are 5, 6, 7, 8mm. There are 8 metal drill bits ranging from 1.5-6mm. The brad point wood bits are 3, 4, 5, 6, 7mm. The Titanium drill bits provide a longer lasting performance. There are 7 screwdriver bits are 25mm in length and 4 that are 50mm and cover all standard fittings.