Feature: 1. Excellent Cutting Capability: This countersink bit set is made of carbide steel with HRC 50‑54 hardness, which offers excellent cutting capability, high durability and outstanding wear resistance. 2. Prevents Clogging: This countersink bit can be adjusted for various lengths of screws to provide a countersink hole in the wood, ensuring a consistent depth of countersink, as well as protecting the work surface and preventing clogging of the chip chamber. 3. Perfect Holes: This countersink bit creates perfect countersunk holes for flat head screws and plug head screws requiring no splitting of wood, just use the bit set and enjoy a neat project. 4. Multiple Uses: This countersink bit is ideal for use on hardwood, softwood, MDF, chipboard and dense plywood. 5. Set of 5 Pieces: The countersink drill bit comes in a set of 5 pieces, providing a range of sizes for different applications. This feature ensures that you have the right tool for the job, anyone who needs a versatile and reliable screwdriving accessory for their workshop or toolbox. Specification: Item Type: Countersink Drill Bit Material: Alloy steel Basic Parameters: Specifications: 8 x 10 x 2.8, 8 x 10 x 3.0, 8 x 10 x 3.2, 8 x 10 x 3.5, 8 x 10 x 4.0. Package List: 5 x Countersink Drill Bit5 x Hex Wrench5 x Wrench5 x Screws5 x Storage Tube Note: Please avoid cutting ferrous metals and other materials such as steel, iron, sand, etc.