Description:

Drill Bit: Cutting edge diameter: 4mm / 0.16", 8mm / 0.31"; shank diameter: 4mm / 0.16", 8mm / 0.31"; total length: 75mm / 2.95", 115mm / 4.53". Features high hardness, good toughness, high wear resistance. Universal round shank for easier clamping and stable cutting process.. Wide Applications: Widely used for drilling stainless steel, aluminum alloy, iron, copper, wood and plastic. Used on electric hand drill, drilling machine and bench drill. Drill metal with high hardness or foreign substance, the rotational speed should be slower than normal drilling.. Sharp Spiral Flutes: Provide neat and smooth cuts. High cutting edge strength, fast cutting speed. Spiral groove facilitates the export of metal chip, saving time and effort in operation. Common flute and overall length for minimal adjustment during tool changes.. Titanium & Nitride Coating: Gold titanium and black nitride dual coating can apply lubricant better for smoother drilling and is more durable and corrosion resistant than the regular black surface.. Tips: Suitable lubricant is conducive to cutting or cooling, making cutting easier and improving smoothness and dimensional accuracy. When using hand-held electric drill, the recommended speed is 100-1000rpm/min; the larger the drilling diameter, the slower the drilling speed..