LudoPam 10-Piece M35 HSS Cobalt Drill Bit Set - 3/16 Inch Jobber Length for Hardened Metal, Stainless Steel & Cast Iron | Perfect for Metalworking, DIY Projects & Professional Use

HSS with 5% cobalt provides hardness for wear resistance.135-Degree split points are self-centering for reduced thrust and easier penetration.Stainless steel, cast iron, high temperature alloy, titanium alloy, hard plastics and woods, and also can be used for softer materials. M35 Cobalt Drill Bit Set A nice-to-have meric size bit set for repeated drilling in metals Cobalt drill bits are not made of pure cobalt, but rather a steel alloy with 5 percent cobalt. The 5-percent alloy is known as M35 grade.Cobalt drill bits are a dull gold color, golden coating is corrosion resistant and increases the hardness of the drill bits.They are made of quality materials, cobalt drill bits tend to stay sharper longer than other types of bits.With cobalt drill bits often being used in much tougher conditions, you will need to sharpen yours every now and then. 135 Degree Split Point The bits have a self-centering 135-degree split point that penetrates hard material without a pilot hole and produces small chips to reduce clogging. Twist Drill Bit Body High-efficiency spiral chip groove can remove chips with high-speed operation to effectively prevent chip accumulation. Straight Shank The straight shank design allows the drill bits for steel to be securely fastened and precision-finished. Read Warm Tips Before Use Stay Cool Friction between bit and metal will accumulate an amount of heat.It's necessary to use cooling liquid during drilling to keep the bit cool. Otherwise, the bit may fry(melt) or only last a short time.It's both ok to use lubricant oil and to pour water. Be Vertical Keep the drill bit vertical with the stuff's surface to be drilled.Tilted bit is prone to break during drilling.Be sure to make both the bit and the workpiece stable. Do It Slow Drilling metal requires low RPM. Please use a device of which the drilling speed can be adjusted.Be careful when you use an electric drill. The RPM could be set too high.The thicker the bit, the slower speed should be. Right Drilling Device To avoid breaking, 1/16” and smaller bits are suggested to be used with a pin viseThick metals are recommended to be drilled with drill press, which is more stable, and adjustableTo have the best performance, you shouldn't drill deeper than 1/2 of the drill bits' fluting length