Cobalt Number Size Drill Bit Set #1-60

Key features

• Multiple Size Options: Featuring 60 sets of numbered drill bits ranging from #1 to #60, with diameters varying from 0.228" to 0.040" or (5.79mm to 1.02mm), designed to cater to a wider range of drilling needs.
• M35 Cobalt Drill Bit: Crafted with M35 cobalt, this drill bit is renowned for its durability, sharpness, and robustness. It excels in cutting through stainless steel, iron castings, copper, aluminum, and other soft metals, as well as plastics and wood, making it a versatile tool for various applications.
• Efficient and Swift: The cobalt drill bit set boasts a 135-degree point tip and twist design, enabling it to work efficiently on both soft and hard materials. Its self-centering feature prevents walk-off and facilitates quicker removal of chips and particles, ensuring faster cutting and smoother operations.
• HSS Drill Bit Set: HSS cobalt drill bit set for hardened steel with excellent cutting performance. 13 sets of drill bits for long term use. The inserts are hardened and polished for improved sharpness and precise cutting without wobbling
• Friendly Reminder: It's crucial to maintain a vertical angle before initiating the drilling process to ensure the drill bit aligns properly with the corresponding hole. If you encounter difficulty in pulling out the drill bit, it may be due to it getting stuck in the protective sponge beneath. In such cases, try repositioning it vertically a few times before gently pulling it out to avoid any potential breakage.

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 (350~202) 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.

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