General description CCYKXA Nitriding Spiral Step Drill Bit is designed for efficient hole cutting and enlarging in various materials. This versatile tool features a total of 8 hole sizes ranging from 10mm to 45mm, making it ideal for woodworking, metal sheet work, and PVC applications. Technical specifications Material: HSS4241 High Speed Steel Coating: Nitrogen coated to reduce friction Hole sizes: 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm Maximum workpiece hardness: less than 25mm Maximum thickness for wood: less than 5mm Usage This step drill bit is suitable for drilling into various materials including carbon steel, sheet metal, insulation board, PVC board, and wood. The spiral cutting flute design automatically deburrs holes as you drill, ensuring clean and precise results.