4.4Mm Titanium Coated M42 High Speed Steel 8% Cobalt (Hss) Twist Drill Bit

M42 steel is a super-hard cobalt high-speed tool steel containing 8% cobalt, with good toughness, high wear resistance, high cutting efficiency, and good hot hardness (Retains hardness even at high temperatures of the cutting edge.). Nanoscale gold titanium coating can apply lubricant better for smoother drilling and is more durable and corrosion resistant. Can greatly improves hardness, wear resistance, and reduces the coefficient of friction. Sharp cutting edge provides fast, neat and smooth cuts. The spiral groove facilitates the export of metal chips, saving time and effort in operation. Chamfered shank design for easier clamping and less slippage during use. The straight shank drill bits are widely used for drilling hardened steel, titanium alloy, stainless steel, copper, aluminum, cast iron, and other metal materials. Do not drill quenched and tempered materials. Suitable for CNC, precision drilling machines, bench drills, medium and high power hand drills. The better the equipment, the higher the processing hardness and the higher the performance. Proper use can greatly extend the working life of twist drill bits. Notice: Choose the right lubricant can facilitate cutting or cooling, make cutting easier, and improve dimensional accuracy. Due to the high speed of the hand electric drill, please pay attention to the speed adjustment when drilling. The larger the drilling size, the slower the speed requirement.