... , T20, T25, T27, T30, T35, T40four-wing bits: 1, 2, 3, 4metric hex bits: 1.5, 2, 2.5, 3, 4, 5, 5.5, 6 ... , 3/16, 7/32, 1/4dodecagonal 'star' bits: M5, M6, M8metric hex with centre bits: 2, 2.5, 3, 4, 5, 6mmfractional hex with ... centre bits: 5/32, 9/64, 1/8, 7 ...