• Includes 7 drill bits of different sizes: 10 mm, 16 mm, 18 mm, 20 mm, 22 mm, 25 mm, and 35 mm. • Four-blade design for faster and more efficient drilling, with improved chip removal. • Self-tapping drill tip with thread for quick and precise positioning. • Universal hexagonal square shank that prevents slipping, compatible with electric, bench, and cordless drills. • Made of high carbon steel 45, these drill bits are durable and suitable for working with wood and plastic. • Not suitable for materials such as concrete, stone, metal, ceramic, or glass. • Recommended revolutions (RPM): 1500-2000 for sizes 10-20 mm, 1000-1500 for sizes 22-25 mm, and less than 1300 for sizes 28-35 mm.