Features: brand new and high quality High-end materials: various diameters can replace multiple twist drills. The step drill bit is made of carbon steel, using for titanium plating process, and has a longer service life. More convenient storage: The step drill set is equipped with a storage bag. It uses magnets to make buttons, so there is no problem even with one-handed storage. One machine with multiple functions: The first-order drill bit can drill holes of different sizes and harder materials to meet your various needs in work. Precision design: The drill tip adopts a bifurcated drill tip design, which not only improves the cutting speed, but also prevents the stepped drill from slipping during operation. As the size of the next step increases sharply, the cutting becomes faster, effectively saving your for time and energy. Wide range of uses: suitable for DIY production, woodworking, workshop processing and other purposes. It can be used to stamp iron and wood within 2mm. Step drill bits can be used with electric hand drills. Use together, work easier. Specifications: Name: Hexagonal Straight Slot Step Drill Specification: 3-12 4-12 4-20 4-32mm Material: High-speed steel 4241 Weight: 260g Processing range: It can open and ream the iron and aluminum plates with a thickness of less than 2 mm. Both hand drills and for bench drills can be used Note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 4xStep Drill