Countersink Drill Bit Set, 5Pcs Woodworking Counterbore Hole Drill Bits For The 82 chamfer angle of our drill bits is designed to match the most commonly used woodworking screws. This ensures a smooth transition from the countersink hole to the screw head, giving your projects a professional finish. The chamfered flute design allow for faster drilling and efficient self-clearing of debris. This guarantees precisely shaped and sized holes with minimal cleanup required. Our countersink drill bit set is crafted from premium High Speed Steel, boasting hardness of HRC 62-64, it offers superior cutting power, high durability, and good abrasion resistance. This ensures long-lasting performance and smooth countersinking in woods. This set comes with 5 additional replaceable drill bits, covering a wide range of screw sizes. Whether you're using a bench drill, hand drill, or a conventional electric drill, these countersink bits are the perfect choice for wood, fiberboard, particleboard, plywood, plastic, PVC, rubber, and more. Compatible with 1/4" standard quick change chucks, including impact drills, our hex shank design allows for quick and easy bit changes. This saves you time and effort when switching between different projects. Check the condition of the countersink drill bits before use, please make sure that both the drill bit and the machine are in good working condition. Avoid using damaged or badly worn drill bits to prevent accidents. During operation, please wear appropriate protective glasses and gloves to prevent injuries caused by splashing wood chips and debris. Keeps your replaceable HSS drill bits organized and safe in a plastic case. If any issues with quality, leave us a message and we will provide a 100% satisfactory solution soon full refund or replacement. Many thanks! Contact Information:Your Account?Your Orders?Sold by?mizhiaheng?Ask a question. If you have any questions, please feel free to contact us.