1,Made of hardened heattreated steel, it is very durable to use. 2,They provide perfect cutting every time for high speed drills. 3, HSS drill bits provide reliable performance and durability when drilling on plastic, aluminum, copper, stainless steel and many other types of materials. 4,Available in 8 different sizes, packed in aluminum box for safe storage and easy carrying. 5,Suitable for carpenters, construction workers, electricians, workshops, DIY, home crafts, amateurs, stylists, etc. Features: 1. Made of hardened heat-treated steel, it is very durable to use. 2. They provide perfect cutting every time for high speed drills. 3. HSS drill bits provide reliable performance and durability when drilling on plastic, aluminum, copper, stainless steel and many other types of materials. 4. Available in 8 different sizes, packed in aluminum box for safe storage and easy carrying. 5. Suitable for carpenters, construction workers, electricians, workshops, DIY, home crafts, amateurs, stylists, etc. 6. Install on the power tool chuck to prevent slippage. Specification: Condition: Item Type: Drill Bit Set Material: HSS Color: Gold Quantity: 8PCS or Set Shank Diameter: 1 or 2 inch Handle Type: Round Surface Treatment: Polished and Ti Coated Drill Length: about 150mm or 6 inches Drill Diameter: 14mm or 0.55in, 16mm or 0.63in, 18mm or 0.71in, 19mm or 0.75in, 21mm or 0.83in, 22mm or 0.87in, 24mm or 0.94in, 25mm or 0.98in Weight: 1788 g or 63.1 oz(approx.) Package List: 8 x Drill Bits Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.