General description This 6-piece set of 90° HSS drill bit countersinks is ideal for creating countersink holes for countersunk screw heads and plugs. Made from carbon steel and coated with titanium, these drill bits are sturdy, durable, and resistant to rust, ensuring a long lifespan. This kit is perfect for home DIY projects and daily use, allowing for efficient drilling without burrs. Technical specifications Material: Carbon steel with titanium coating Set includes 6 drill bits with the following dimensions: 6.3MM: Head Size 6.3MM, Shank Diameter 5MM, Length 37MM 8.3MM: Head Size 8.3MM, Shank Diameter 6MM, Length 40MM 10.4MM: Head Size 10.4MM, Shank Diameter 6MM, Length 39MM 12.4MM: Head Size 12.4MM, Shank Diameter 10MM, Length 46MM 16.5MM: Head Size 16.5MM, Shank Diameter 10MM, Length 47MM 20.5MM: Head Size 20.5MM, Shank Diameter 10MM, Length 47MM Compatibility and accessories Universal size compatible with all types of drill bits and drilling machines, including vertical drilling