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Product Contain: 10pcs Center Drill BitsDrill accurate center holes in material prior to turning, or use as a starter bit for accurate holes. Used for producing center holds in components or work pieces with require machining between centersDue to manual measurement, and production, the batch is not the same, size, weight, color, there will be a certain error, error within 2% of the normal situation.SOMETHING ABOUT US- ZXHAO have the customers satisfaction for their first priority. If you have any questions,please feel free to contact us by mail FIRST. We will offer our best service for you.