Step Drill Bit, 4pcs HSS Metal Countersink Drill Bit 4-12/20/32mm Titanium Coated Triangle Taper Drill Countersink Steel Step Drill Bit Screwdriver for Drilling Steel/Wood/Brass/Plastic/PVC

General description Made of high-quality HSS (High-Speed Steel), this set of step drill bits is designed for durability and efficiency. The titanium coating enhances rust resistance, allowing for quick and precise drilling through various materials including steel, brass, wood, plastic, thin iron sheets, aluminum, insulation boards, and PVC sheets. This versatile tool is suitable for DIY projects, home improvement, and construction tasks. Technical specifications Material: High-Speed Steel (HSS) Coating: Titanium Drilling Diameter: 4-32mm (includes sizes: 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm) Length of bits: 4-12mm (Approx. 6.7cm), 4-20mm (Approx. 7.7cm), 4-32mm (Approx. 10cm), 4mm Twist Drill (Approx. 7.2cm) Maximum thickness for use: 4mm Hardness limit: Less than 25 HRC Usage These step drill bits are ideal for drilling holes in various materials. They are particularly effective for ordinary aluminum, iron, and steel plates, but are not suitable for stainless steel. To maximize the lifespan of the bits, it is recommended to oil them before each use.