【You Will Receive】: Wood Countersink Drill Bit, A Set of Countersink Wood Drill Bits, Including 5 Countersink Drill Bits. 5 Different Drill Diameter Sizes: 2.8mm, 3mm, 3.2mm, 3.5mm, 4mm 【High Quality Materials】: Countersink Drill Bit Set, Our Countersink Drill Bit Is Made Of High Quality Alloy And High Speed Steel To Ensure Its High Hardness And Durability, Which Can Quickly And Accurately Drill Smooth And Beautiful Holes And Provide Excellent Cutting Ability 【5 Interchangeable Twist Drill Bits】: Countersink Drill Bits, Countersink Wood Drill Bit Set, 5 Interchangeable Center Drill Bits With Spiral Groove, Can Be Removed For Easy Cleaning And Replacement. Use the center drill bit for the spiral groove, which can quickly evacuate the chips from the hole 【Practical design】: Practical 90° countersinks with built-in twist drills for fast and concealed countersinking of screws. They can effectively prevent the accumulation of debris and improve drilling efficiency 【Applicable materials】: