Milling Bits for Aluminum 55° 2-flute 90° edge Angle aluminum coated extended point bit 55° 3-flute CNC flat end milling cutter for aluminum 55° 3-flute rough aluminum end mill Colorful coated 3-flute carbide extended straight shank flat bottom aluminum milling cutter DLC colored coated 3-flute side milling for aluminum alloy HRC55° lengthened small diameter micro diameter aluminum deep groove end mill U-groove colorful coating 3-flute copper aluminum alloy CNC special milling cutter Single-flute aluminum CNC woodworking engraving machine tool milling cutter