Black finish drills Roll forged DIN 340 RN HSS or ČSN 221125
Standard roll forged drills recommended for drilling holes with greater depth in components made of non-alloy and alloy steel, steel castings up to 900 N/mm2, gray, malleable and ductile iron, sintered steels, aluminum alloys with short chips, bronze, tough brass.
Standard long roll forged drills recommended for deep-hole drilling to unalloyed steel or alloyed steel, cast steel up to 900 N/mm2, grey-, malleable or nodular cast iron, sintered steel, Al-alloys with short chip, bronze, tough brass.
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