Features: Step drill is used for drilling and reaming steel plate, aluminum, copper, photovoltaic panel and insulating panel. Excellent carbon steel material, strong and durable. Drilling is not easy to slip. Higher precision, more for sharp, burr-free drilling. The unique step structure, a drill can drill a variety of sizes of the aperture. Suitable for installation in the for bench drill. Specifications: Material:Carbon Steel Type:3pc Triangular Straight Groove Step Drill + 3pc Saw Drill/ 3pc Hexagonal Straight Groove Step Drill + 3pc Saw Drill/3pc Hexagonal Spiral Groove Step Drill + 3pc Saw Drill Step Drill: 4-32mm, 4-20mm, 4-12mm Saw Drill: 3mm, 6mm, 8mm Color:Yellow Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package includes: 6 Pieces Step Drill Bit Saw Drill Bits/Set