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3Pcs Spiral Step Drill Bit Set with Automatic Spring Loaded Center Pun
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Product Details
High speed, titanium nit-ride coated steel Replaces 28 separate drill bits Two fluted design for fast, smooth cutting. br||When inject cold water while working, can effectively extend the service life of the drill bit. Recommend drilling rate of 250-250 RPM. br||Shank: 1/4" Quick Change Hex Shank br