Mill Diameter Inch 78 Number of Flutes 4 Length of Cut Inch 178 Material Cobalt Overall Length Inch 418 Shank Diameter Inch 78 FinishCoating Bright Single or Double End Single The 4 flute Ball End Mills are designed for milling of radius bottom slots, fillets and special contours The end teeth are cut to centre allowing these end mills to drill into material at the beginning of a slotting cut