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Cobalt Drill Bit Set 4mm - 10pcs, M35 Twist Drill Bits Straight Shank, 4mm High Speed Steel Drill Bits for Drilling in Hard Metal, Stainless Steel, Cast Iron
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Cobalt Drill Bit Set 4mm - 10pcs, M35 Twist Drill Features
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✅【5% COBALT TWIST DRILL BITS SET】Made from M35 Cobalt Steel with Molybdenum and Cobalt added to form a hardened alloy, can measure up to 67 Rockwell hardness, cut faster, last longer, and last longer than normal HSS drill bits 17 times.
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✅【10PCS METRIC DIRLL BITS SET】The set includes 10pcs of M35 4MM cobalt steel twist drill bits. Organized in a sturdy plastic storage case for easy transport to your workplace.
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✅【TWIST DESIGN AND PERFORMANCE】Precise 140° SPLIT Point, Gold Oxide Surface and Round Straight Shank. Prevents walking and removes chips and particles faster. Precision fully ground to ensure smooth chip movement.
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✅【VERSATILE USE】Our M40 Cobalt High-Speed Steel drill bits are ideal for cutting through hard materials like stainless steel, steel, and cast iron, as well as wood, aluminum alloys, and other metals. Please note that they are not suitable for glass or ceramic materials. Pay attention to speed, pressure, and heat control when drilling.
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✅【SATISFACTION GUARANTEED】We stand behind the quality of our product. If you have any problems or are not satisfied with our metric drill bit set, please feel free to contact WildBossy for assistance.
About Cobalt Drill Bit Set 4mm - 10pcs, M35 Twist Drill
Suitable for drilling stainless steel, hard metal, aluminum, copper, plastic and hardwood. The 3-step design enables accurate centering, suitable for woodworking operations requiring precision drilling. In addition, the cobalt design allows it to perform better in hardwood boreholes. Control the bit speed from 200 to 1000 RPM, making it easier to drill in stainless steel. High RPM does not improve drilling efficiency, but rather increases the heat between the bit and the workpiece, which may cause the bit to soften and the workpiece to harden. Drill bit diameter ≤5mm, speed (1000~700)5-10mm, speed (700~350)10-15mm, speed (350~200) use cutting fluid to make the drill bit more durable. Stainless steel tapping oil or engine oil is added to prevent the stainless steel from overheating and forming a very hard oxide layer.
