General description This set of 3 step drill bits is designed for precision drilling in various materials including steel, brass, wood, and plastic. Made from high-quality HSS steel with a titanium coating, these bits reduce friction and heat, ensuring efficient performance. The unique step design allows for drilling holes of different sizes, ranging from 4 mm to 32 mm in diameter, without the need for pilot holes or pre-drilling. The bits automatically deburr the holes as you drill, making them ideal for thin metals, aluminum, copper, fiberglass, and PVC. Technical specifications Material: HSS M42 steel with titanium coating Size range: 4 mm to 32 mm Recommended speed: 250-400 RPM/min Suitable for materials with hardness of 25° or less and thickness under 5 mm Usage Ideal for drilling in steel, brass, wood, plastic, and thin metals Use water or coolant to prevent overheating during operation Always wear safety goggles when using these tools Other information Sizes are laser-engraved