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Junterone Step Drill Bit 4-12/20-32Mm Nirtird Coated Wood Metal Drilling Tool Metal Hole Cutter Step Cone Drill Bit

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Product description

  • Features: steel material, more .Nitride coated to reduce friction and run cooler No need for a pilot hole, can automatically deburr holes as you drill.Special step stucture, can drill different size holes, 1 step drill can be used as 1 box of drill bit.
  • Working with water cooling, can effectively extend the service life of bit,drilling speed 250--400 recommended.Widely used to cut holes variety of material like thin steel board, wood, thin iron, aluminum alloy,insulation boards, PVC sheet,.

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