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Premium Set: Our premium 4 piece countersink drill bit set features HSS tapered pilot drills in sizes 2 .8MM×8MM , 3 .2MM×8MM , 3 .5MM×10MM , and 4 .0MM×10MM Quality Material: The pilot drills are made of high speed steel with spiral chip design for efficient cutting while the pointed tungsten carbide edges ensure smooth countersinking and counterboring holes , making them ideal for screws with 82 degree imperial (US) standard Adjustable Depth: Both drilling and countersinking depth can be easily adjusted using the hex key and depth control stop , providing greater flexibility for various tasks and applications Versatile Application: Suitable for various materials including natural wood , engineered wood , MDF , particle board , plywood , aluminum , nonferrous metals and decorative materials , this set is ideal for various woodworking and drilling projects Usage Tip: For optimal performance and clean edges , operate the countersink at a low speed of about 200 RPM