0001,-. These miniature end mills feature a long flute that is either 5, 8 or 12 Xs the diameter as listed Premium Sub-Micrograin Solid Carbide End Mill3 FluteSquare EndSingle End 30° Helix1/8" Shank x 2-1/2" Overall LengthLong Flute DesignCenter Cutting Carbide EndmillView Carbide End Mill Speeds & FeedsCarbide End Mill TolerancesSize RangeDiameterShankAll Sizes+.0005, -.