1pcs HSS Metric 1/4 Titanium Coated Hexagonal Drill Bit Step Drill Bit Smoother Drill Bit Set Bulk Pack Nickel Features: . Cobalt high-speed steel together with titanium coating ensures extreme durability, it will remain new and shiny for many years. Please mark the place where you need to drill to make drilling easier and improve the service life of the drill bit. It is suitable for cutting holes in a variety of materials, including thin iron, aluminum, insulation board, wood, plastic, etc. (the plate must be smaller than the height of the step drill). Cutting size includes (5 steps): 4-12mm (4mm, 6mm, 8mm, 10mm, 12mm). Specifications:Material: High Speed SteelColor: GoldHex Chuck: 6.35mm Optional Sizes: 4-12mm 4-12mm:4,6,8,10,12mm Package Included:1PC Drill Bit StepNote:Please allow 1-5mm deviation due to manual measurement. Due to the light and screen difference, the item's color may be slightly different from the pictures. If you have any questions, you can via trademanager or message, we will always be here and answer all your questions at the first time.