... , 30mmReduced straight shank twist drill sets in wooden box1) Model no. 301-1438, 8pcs shank 13mm DIN338, 13, 14, 15, 16, ... 18, 20, 22, 25mm2) Model no. 301-0204, 5pcs shank 1/2" 17/32", 9/16", 5 ... shank 1/2" 17/32"-1" by 16th&32nd10) Model no. 301-0216, 16pcs shank 1/2" 17/32"-1" by 32nd11 ... 32pcs shank 1/2" 33/64"-1" by 64th13) Model no. 301-0240, 40pcs shank 1/2" 33/64" to 1" x ...