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1. Please keep cool and gentle using, the working life of the twist drill bits can be largely prolonged by proper usage. 2. Not For Use On Concrete, Masonry 3. Please allow 0.05-0.08 inch difference in size measurement for variance due to manual measurement. 4. Return: Our 30-day Satisfaction Guarantee assures you will receive all orders promptly and exactly as described. In addition, it allows you to return new and unused products for any reason within 30 days from the date of purchase. 5. Your satisfaction is our utmost concern, please feel free to contact us for any questions and concerns. If for some reason there is any issue with the purchase, please contact us prior to leaving feedback, and we will be glad to work with you to have it got the best resolve