The SE #61-80 HSS Twist Drills Set (20 PC.) is made of high speed steel. The set includes sizes #61 to 80. This item is great for drilling ferrous metals, tough casting sand forgings, working hardened stainless steel, and other hard steels and tough high tensile strength nonferrous metals like titanium. These twist drills are fully polished and grinded and come in a plastic storage case. Warning: Using hand tools can be dangerous. Always take care and keep away from children. Wear protective eyewear in work area at all times. Select correct type and size of hand tools for work. SE is committed to providing the customer with the best source for value possible on the market. You will enjoy the quality, function and usefulness of our SE #61-80 HSS Twist Drills Set (20 PC.). IPR Rights Notice: Important: Avoid getting counterfeit items. Genuine SE products come with the SE logo on the packaging. SE is a registered trademark protected by US Trademark Law.