4mm 3 Flute Solid Carbide Drill Bit. Decimal Equiv. 0.1575, Flute Length 23, Overall Length 50. Designed for hardened steel, stainless steels, exotic materials 45-65 Rockwell "C" scale. Produces perfect chips without generating excessive heat. Accurately sized holes are produced without annealing or softening the workpiece. Reamer type finishes. Both a production drill and a salvage or reclaim tool.
Tolerance = Dia. + .000/-.005 Metric = h7