5 and larger)MATERIALS:brass, copper, lead, stainless steels, carbon steels,zinc, most ductile materials producing stringy chipsare great for forming.5 Thread ChamferFor blind hole tappingPLUG: 4.5 Thread ChamferFor maximum thread length in blind holes due toits short chamferBOTTOM: 2.Premium High Speed Steel Metric TapsTiN coated for better performance and increased tool lifeThread Forming/Roll Style TapsPlug Tap sizes M10 and smaller have male centersSINGLE THREAD: 1.