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Product Size: - Hex Shank diameter: 7/16 inch - Drill bit size: Dia.:1/4 inch ; Available Length: 2 inch - Applicable drill: 1/2 inch drill - Applicable hole saw: 1-1/4 inch to 6-3/8 inch *Store Introduction & Service:LICTOP first priority is customer satisfaction. If you have any questions about the product, please feel free to contact us. We will be the first time to help you solve the problem. * Note: Due to manual measurement and production batch is not the same, the size, weight, color, there will be some error, the error is within 5% of the normal case. (Please make sure you don't mind before ordering.)