• Countersink drill bit set with 3 different sizes: 12 mm, 16 mm, and 19 mm. • Made of high-quality carbon steel with quenching treatment for greater hardness and resistance. • 5-flute design with staggered cutting teeth ensuring free chip flow and fast cutting. • Standard 1/4 inch hex shank for quick and convenient change. • Ideal for working on wood, soft metals, rubber, and plastic. • Suitable for openings, chamfers, and the seating of screw heads.