About this item Premium Material: Multifunctional carbide drill bit with a reinforced head that prevents the bit from cracking. Twist hole saw set made of hard and durable alloy, provides longer service life. Our drill bit set with 9 different sizes. Efficient Design: Our orange drill bit set with triangular shank handle is designed to prevent slipping and can hold the drill bit firmly and stably in the Electric drill. U-type slot design achieves perfect chip removal capability with overall sandblast treatment. Widely Used: ultimate punch drill bits with sharp cutting edges for versatile drilling in drywall, brick, tile, wood, aluminum and sheet metal. Sharp design tough tungsten carbide tip can easily penetrate various materials and reduce breakouts. Safe and Convenient: Ultimate punch drill bits with U-shape groove provide effective scrap and heat dissipation. The tri-flat on the shanks of the drill bits is a special sharpening technology, can reduce cutting resistance and improve drilling efficiency, is built for a tighter chuck maximizing safety for precise holes. Warm Tips: Our Drill Bit Set is resistant to high temperature around 1000C. However, a long working session over 1000C may cause the head to burn out. Therefore, the addition of water is necessary when drilling on high hardness material. These drill bits can be used to load drill, hand drill, bench drill, etc. Do not use the hammer mode of the drill or hammers.