M35 Cobalt Step Drill Set with Four Groove Design – Durable & Efficient Drilling. M35 Cobalt Step Drill Set. Durable & Efficient Drilling. Four Groove Design: The ordinary step drill often flexes during cutting, but our unique four groove design enhances stability, improving accuracy and cutting speed. Sizes range from 1/4″ to 1-3/8″ with 19 step sizes. M35 Cobalt High Speed Steel: Crafted from M35 cobalt high speed steel, our drill bits exhibit superior hardness, red hardness, and wear resistance. They outperform standard high-speed steel when tackling hard materials, giving you confidence in every cut. TiAlN Coating: This advanced coating material boasts high hardness and oxidation resistance, as well as excellent thermal properties. Enjoy smoother drilling with lower friction and heat build-up. 135° Cutting Angle: The increased angle enhances performance on hard materials compared to the standard 118°. We recommend using cutting oil or spray water to cool the drill during extended operation, prolonging tool life. If you encounter any quality issues, our dedicated after-sales service team is here to assist you. Your satisfaction is our priority! Why Choose Our M35 Cobalt Step Drill Set? Invest in a drill set that prioritizes durability and efficiency. Experience the difference with our M35 Cobalt Step Drill Set – designed for unparalleled performance, especially when working with hard materials. The four groove design minimizes flexing, enhancing both stability and precision while you drill. Discover an upgraded drilling experience; elevate your toolkit today with our M35 Cobalt Step Drill Set! Alternative Carriers – We may use alternative carriers e. To ensure your package arrives safely and on time. Your feedback is extremely important to us. We strive to provide the best products and customer service possible. We are committed to resolving any problems and ensuring your satisfaction. Item Height: Not Set. Item Depth: 1.46 inches. Unit Quantity: 0.16 ounces. Suitable For: Commercial, Drill, Residential, Stainless Steel, Wood, Aluminum, Plastic. Type: Step Drill Bit. Number of Items in Set: 1. Country/Region of Manufacture: Not Set. Item Diameter: 1-3/8 inches. Item Length: Not Set. Item Width: Not Set. Item Weight: 0.16 ounces.