1. Application: The HSS step drill set is very suitable for drilling holes in various materials, including steel, brass, wood, plastic, etc.2. Drill perfect round holes: After heat treatment and mirror polishing, the step drill set can drill perfect round holes in steel, brass, plastic, wood, etc.3. Side shaft design: The side shaft design prevents slipping in the chuck. Exquisite workmanship, beautiful appearance.4. Cut quickly and smoothly: The double-edged design ensures faster, smoother, and cleaner cuts. Each step is clearly marked with the depth diameter in steps.5. High-speed steel: The step drill set for metal and wood is made of high-speed steel, which is robust, durable, and long-lasting.Specification:Item Type: Step Drill SetMaterial: High-speed steelColor: As shownWeight approx. 120g/4.2ozApplication area: thin iron plate, aluminum, insulation board, PVC plate cutting, etc.Product specification:4-20mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm), 76mm handle3-12mm (3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm), 79mm handle4-12mm (4mm, 6mm, 8mm, 10mm, 12mm), 67mm handlePackage list:3 x opening drill1 x transparent box