MICRO 100, SFA-250-46, solid carbide, single flute router. Designed and engineered with optimized rake and clearance angles that produce, high speed and high material removal rates while providing improved surface finishes in most routing applications. The innovative single flute end mill geometry avoids chip melting and chip re-welding problems. This router has a unique open flute design with a polished, mirror-like flute finish. Best suited for aluminum 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.