Features Durable Carbon Steel Construction - Crafted from high-quality carbon steel, this set offers exceptional hardness and strong cutting force for reliable performance in various materials Versatile for Multiple Applications - Ideal for DIY projects, household repairs, and general construction, ensuring you have the right tool for any task at hand Precision Centering and No Slipping - Designed for accurate drilling, these bits provide excellent centering, allowing you to create glossy holes quickly and effortlessly Efficient Chip Discharge Design - Featuring a five-sided chamfer, this set automatically discharges chips from both sides, significantly enhancing drilling efficiency Complete Set with Size Markings - Includes 5 different sizes for versatile use, each drill bit comes in a labeled plastic box for easy identification and organized storage Features: 1、Made of classic carbon steel material, drill bit has high hardn, strong cutting force 2、Widely used in DIY, household and general construction or engineering use, etc 3、With good centering and no slipping,drill bit set is able to drill glossy holes quickly and accurately 4、Five？side chamfer design, automatically and quickly discharge the chips in the holes on both sides, and improve the drilling efficiency 5、The countersunk drill bit kit includes 5 sizes to meet your various needs, and each drill bit comes with a plastic box marked with a size to facilitate your identification and storage Specification: Item Type: Countersink Drill Bit Set Material: 45#Carbon Steel Counterbore Size: Approx. 2.8 x 8mm / 0.1 x 0.3in Approx. 3 x 8mm / 0.1 x 0.3in Approx. 3.2 x 8mm / 0.13 x 0.3in Approx. 3.5 x 8mm / 0.14 x 0.3in Approx. 4 x 8mm / 0.16 x 0.3in Package List: 5 x Countersink Drills 5 x Wrenches 5 x The Spare Screws 5 x Plastic Packaging Boxs Note: 1.Use the center punch to locate before drilling, keep the drill bit vertical, and prevent the drill bit from bending or breakingbetweendiv>2.Please allow 0‑2 cm error due to manual measurement. Thanks for your understandingbetweenbetweendiv>between Package List 5 x Countersink Drills 5 x Wrenches 5 x The Spare Screws 5 x Plastic Packaging Boxs