Drill + tap set 229C ( 18 Pcs ) in metal cassette to produce Unified National Coarse and Fine threads from UNC 6-32 up to UNC 1/2", consisting of 5 HSS bright finished straight flute hand tap 1500(UNC), 3 HSS bright finished straight flute hand taps 1528(UNC), 1 HSS bright finished straight flute hand tap 1528(UNF) and 9 HSS bright finished jobber length drills with straight shank R10P, R15P + R18P for the recommended pre-machined hole diameters for 1.5xD through or blind hole threading in general purpose applications
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