1. drill bits are made from premium quality titanium coated high speed steel (HSS). These bits will stay sharper, last longer, and can drill at higher speeds than uncoated and oxide-coated drill bits. Double U shape flutes design clear chips effectively. 2.135° split point angle drill bits keep centered without a pilot hole. These jobber self-centering drill bits have the rigidity and length for most applications of corded or cordless hand drills and drill presses. Ideal for drilling mild steel, aluminum, copper, soft alloy steel, wood, and plastic. 3.14 different sizes including 16PCS 1/16', 16PCS 5/64', 15PCS 3/32', 10PCS 7/64', 10PCS 1/8', 8PCS 9/64', 8PCS 5/32', 3PCS 11/64', 3PCS 3/16', 2PCS 13/64', 2PCS 7/32', 2PCS 1/4', 2PCS 5/16', and 2PCS 3/8'. 4.A rugged case keeps all drill bits well organized. Molded size on the case lid will help you to identify the bits you need with less effort. Included center punch will help you to mark and drill more precisely..