Feature:1. Rigid Alloy Steel: This countersink drill bit set is made of carbide steel with a hardness of HRC 50 to 54 and the countersink bit offers excellent cutting ability, great durability and good wear resistance.2. Flexible Adjustment: The countersink drill bit is adjustable for different lengths of screws and creates countersunk holes in the wood, ensuring a consistent depth of countersunk holes and protecting the work surface and debris chamber.3. Simple Operation: This countersink drill bit makes perfect countersunk holes for flat head screws and plug head screws. Users just use the drill set and enjoy a neat project without splitting the wood.4. Wide Application: The countersink drill bit is suitable for wood, MDF, particle board, dense plywood, MDF, hardwood, softwood and particleboard.5. Completed Accessories: There are one countersink drill, one hex wrench, one wrench screw and one storage cylinder.6. Convenient To Carry: The countersink drill bit set is equipped with a storage bag which is small and light, so it is convenient for users to take the set outdoors.Specification:Item Type: Countersink Drill Bit SetMaterials: Alloy SteelSize: Approx. 8mm x 8mm x 3.2mm/0.31in x 0.31in x 0.13in.Package List:1 x Countersink Hole Drill1 x Hex Wrench1 x Wrench1 x Screw1 x Storage TubeNote:Please avoid cutting ferrous metals and other materials, such as steel, iron, sand, etc.