HSS Co hand drill tap set M, sheet steel case, 21 parts, M3 - M12. Supplied = assembled. Finish = bare. Colour = silver. Conforms to = ISO 2/6H, DIN 352. Rougher tap = approx. 5 - 6 turn cut. Second tap = approx. 4 - 5 turn cut. Regroover = approx. 2 - 3 turn cut. Number of parts = 21 pcs. Cutting material = HSS Co. Product type = hand drill taps. High strength hinge. DIN 352, tolerance in accordance with ISO 2/6H. Including roughing tap, second tap and bottom tap in each size. For through-hole and blind hole threads, right hand cut. With relief ground flanks. High performance cobalt alloy steel, polished surface. Ideal for use in unalloyed and low alloy steels with a strength of up to 900 N/mm, annealed cast materials and non-ferrous metals.