MICRO 100, SR-312-6, precision ground, solid carbide blanks. Designed and engineered for those who manufacture a variety of solid carbide tooling such as end mills, boring and/or turning tools, drills, and other stationary and rotary type tools/tooling. Best suited foremost types of 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.