10 Pcs High Speed Steel Cobalt Drill Bit Set 2 Pcs of Each 1mm(3/64"), 1.5mm(1/16") 2mm(5/64") 2.5mm(3/32") 3mm(1/8") Jobber Length Twist M35 Metal Drill Bit For Stainless Steel And Hard Metal

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10 Pcs High Speed Steel Cobalt Drill Bit Set Package quantity: 10 pieces 2x 1mm(3/64") Diameter, 35mm Length 2x 1.5mm(1/16") Diameter, 40mm Length 2x 2mm(5/64") Diameter, 49mm Length 2x 2.5mm(3/32") Diameter, 56mm Length 2x 3mm(1/8") Diameter, 62mm Length Shank: straight shank Material: industrial grade High Speed Steel with 5% cobalt alloy Tip point: 135-degree split-point tip Package: plastic bag Very tough professional cobalt drill bit set for micro hole drilling into stainless steel, light-gauge metal, high-carbon steel, aluminum and ally steel, cast iron, abrasive alloy metal, other hard metal and hardened steel. 4 times life time than normal metal drill bit when drilling into PCB board, plastic, wood, jewelry, sheet metal and normal steel. Fast and precise drilling, heavy duty with long life time. If drilling or cooling oil is applied, it can reach even better drilling result and prolonged life time when drilling into very hard materials. Ideal micro drill bit for PCB board drilling, IT hardware engineers, repairing and maintenance staff, jewelry artists, wood working DIYers, hard metal part processors and other hand work professionalsUser Instructions: To effectively use cobalt drill bits on hard metals, keep speeds low, use a metal cutting paste or fluid for lubrication, apply firm but steady pressure, and back out the bit frequently to clear chips and cool the bit. Always secure your workpiece and consider using a pilot hole for thicker materials to prevent bit walk and reduce stress.Essential Tips for Drilling AluminumAluminum is a soft metal, but don’t think it is easy to drill through. It melts at just 660°C, and the chips can fuse onto your bit if it gets too hot — especially when drilling thicker sections. Cobalt drill bits with at least 5% cobalt can dissipate heat faster, reduce chip welding and improve hole quality. They’re more resistant to wear. Drilling aluminum can be smooth and hassle-free — if you use the correct drill bit and technique. But ignore the essential tips, and you could end up with melted metal, gummed-up drill bits, or damaged workpieces.1. Start from Low Drilling Speed: Too much speed = too much heat. And heat is your enemy and is detrimental when drilling aluminum. Start from very low speed depending on your drill bit size, material thickness and hardness.2. Always Use a Cutting Lubricant: Apply a cutting paste or fluid to reduce friction and prevent aluminum from sticking to the bit.3. Apply Light, Consistent Pressure: Let the drill bit do the work by avoiding excessive pressure, which can lead to clogging. Avoid leaning into the drill.4. Clear Chips Regularly: Pull the drill out of the hole frequently to clear away aluminum chips and prevent the bit from jamming.5. Safety First: Always wear safety goggles and secure your workpiece with a clamp.