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MICRO 100, TBB-312, carbide brazed tip boring bars. Designed and engineered with precision ground steel shanks and carbide tips. Ideal for boring/turning and is extremely heat-resistant when used for high speed applications on cast iron, nonferrous materials, plastics and other tough-to-machine materials. MICRO 100 Solid Carbide Tools feature more than just a micro-grain of excellent quality. Their substrate is in a class of its own, resulting from an exclusive treating process that allows for increased speeds and feeds and extended tool life. For over 45 years, MICRO 100 is a known industry leader and internationally acclaimed.