General description Premium M35 cobalt steel step drill bit designed for stainless steel and metal applications. With a hardness rating of 66-69 HRC on the Rockwell scale, it offers exceptional heat resistance, wear resistance, and chip resistance, ensuring a long tool life. This drill bit is capable of cutting through various materials including stainless steel, iron plate, aluminum, conduit, wood, PVC, and plastic, and operates two to three times faster than standard drill bits. Technical specifications Material: M35 cobalt steel Hardness: 66-69 HRC Size range: 4-32mm Steps: 15 (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm) Usage Ideal for drilling stainless steel, sheet metal, conduit, steel, copper, brass, aluminum, plastic, vinyl siding, drywall, PVC, and cast iron. For optimal performance, use cutting fluid, engine oil, or water to prevent overheating and the formation of a hard oxide layer. Alternative options include vinegar or soy