3&4FLUTE,LONG LENGTH,ROUGHING BALL NOSE Designed to machine tool steel,alloy steel,mold steel and other high hardened materials; High velocity milling of hardeded steels; For dry and wet milling; Fast chip djection. material: Micro Grain Crabide is used in the tool material Helix angle :20degree; Flute:3&4 flutes; The types of periphery:Fine pitch type; DIN 6535HB Mill Diameter:6.0-20.0mm; Shank Diamter:6-20; Length of cut:16-38; Overall length:57-104