HSS and Titanium Coating - High speed steel makes it more durable than others, titanium coating makes it easy to cut steel sheets, aluminum sheets, copper, plastic etc, wood and many other types of sheet metal. It can automatically deburr holes when drilling to keep the drill bit clean. Slotted tip increases speed. A must have for family, DIY or professionals - Perfect for home repairs and light jobs like drilling holes in plastic, aluminum, copper and many other types of sheet metal. Package includes: 1 x HSS step drill 6-60mm (12 steps: 6mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm) Step drills are made of high speed steel with titanium coating, which allows for long life. < p>Features: 1. High speed steel for longer life. 2. Dual cutting blades design provides faster and smoother cutting. 3. Advanced dual spiral groove design outperforms straight groove design and extends bit life. Slotted tip increases speed and also features laser etched measurements to