[Countersink Drill Bit Set] This countersink drill bit set includes 5 different sizes: 1/4 inch, 3/8 inch, 1/2 inch, 5/8 inch, and 3/4 inch, catering to various drilling needs and applications. [Accurate Countersinking] Featuring 5 flutes and a precise countersink angle, these bits allow for quick and accurate countersinking, cleanly embedding screws. [HSS Construction] Constructed from high-speed steel with Ti coating, these countersink bits offer high hardness and durability for long-lasting performance. [1/4 Inch Hex Shank] With a standard 1/4 inch hex shank, these bits can be easily installed in drill chucks without additional adapters, compatible with most handheld and stationary drills. [Versatile Application] Suitable for use on materials such as wood, metal, and plastic, this countersink drill bit set is ideal for woodworking, metalworking, and general drilling tasks.