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9 Steps:1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, 1?, Patented 2-Flute Design cuts fast, clean, burr-free, round holes, Steam Oxide Coating improves durability, Enhanced Flute Design for more rapid chip removal, Split Point Design prevents walking
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1.888.467.7626