Professional quality item with a wide range of uses: M35 high speed steel 5% cobalt drill bits for drilling stainless steel and hardened steel materials. They can also be used to drill metals and other materials, such as cast iron, copper, high temperature alloy, titanium alloy, aluminum, hard plastics and woods, etc. Premium Materials: M35 High Speed Steel with 5% Cobalt. Durable and strong for longer use. Drill bits suitable for drilling tough metals including stainless steels, Cr-Ni and special acid-resistant steels. Heat resistant: high speed steel twist drill bits with cobalt should be used at 1,500 rpm or more for maximum efficiency. The straight shank provides a firm and precise hold, compatible with standard chucks and regular round collets. Twisted design and performance: precise 135 split point, gold oxide finish and shanks round lines. Prevents exits, removes splinters and particles faster. Product fully precision ground, ensuring chips move easily. Easy storage and use: 10pc M35 steel and cobalt twist drill bit set - Drill diameter: 3.5mm - Spline length : 39 mm - Total length: 70 mm. Set of 10 pieces packed in a plastic box for easy use and storage. Features: High speed steel surface, titanium coated. M35 HSS with 5% Cobalt provides hardness for wear resistance, piercing ability. 135 degree split points are self-centering for reduced thrust and easier penetration . Apply to drill stainless steel, hard steels, metal, cast iron, copper, aluminum, plastic and wood. Ideal for DIY , home and general construction/engineering. Specification: 135 split point tip and twist design: Increases cutting speed with self-centering and prevents walking, removes chips and particles faster Material: M35 HSS with 5% cobalt Angle point: 135 degrees Type of Flute: Spiral Stem Type: Straight Stem Size: 3.5mm x 70mm Drill Diameter: 3.5mm Flute length: 39mm Overall length: 70mm Professional and widely used: Our M35 Cobalt HSS Jobber twist drill is more suitable for drilling hardened materials, such as steel, stainless steel, copper, cast iron, high temperature alloys, titanium alloys, hard plastics and woods, and can also be used for materials softer, such as like wood, plastic and aluminum etc. Widely Application: Handheld devices Suitable for lithium drill, hand drill, impact drill, etc. Flat drilling equipment Suitable for bench drill, magnetic drill, column drill, milling machine, machining center, etc. . Package Included 10 x 3.5mm HSS Cobalt 5% Jobber Twist Drill Bit Notes: The life of the twist drill bits can be largely extended using coolant.