The MICRO 100 GEMM-160-4 metric size, uncoated, 4 flute, 30? helix, center cutting end mill. Designed and engineered as a universal application type end mill with a slightly increased flute and overall length for greater versatility. These high performance end mills feature a 30? helix with a conventional tool geometry that supports applications in a wide scope of different materials , ranging from soft to hard. Manufactured with close tolerances to ensure ultimate precision and performance. Each tool's cutting edge/tip has a distinctive mirror like finish that significantly adds to material removal while improving surface finishes. 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 exclusive treating processes that allow for vastly increased speed and feed rates. For over 45 years, MICRO 100 is a known industry leader and internationally acclaimed when it comes to solid carbide tooling.