• 99-piece set with sizes from 1/16" to 3/8". • Made of high speed steel (HSS) with titanium coating to increase durability. • Hardened and polished edge for greater sharpness in various materials. • 1/4" hex shank that allows for a quick change and prevents slipping in the chuck. • 135-degree split point design for automatic centering and fast penetration. • Geometry designed for smooth and efficient chip removal. • Suitable for working on wood, aluminum alloy, stainless steel, copper and plastic. • Includes box for storage and organization of all pieces.