CoCud Solid Carbide Drill Bits, 4.25mm Diameter, K35 Tungsten Carbide Precision Short Length Twist Drill Bits - (Applications: for Stainless Steel Alloy Metal), 2-Pieces - cuf221104dd0458

• ★ Carbide Drill Bit Size --- Drilling diameter: 4.25mm / 0.167". tool flute length: 23mm / 0.91". shank diameter: 4.25mm / 0.167". overall length: 45mm / 1.77". tool flute type: spiral. cutting hardness: up to HRC50. processing technology: fine grinding ★ Wide Applications --- Suitable for drilling stainless steel, alloy steel, carbon steel, die steel, tool steel, copper, hard plastic and other materials below HRC50. Widely used in maintenance departments, machine shops, and other industries. Use on machining centers, CNC lathes, drill presses and bench drills. ★ Spiral Flutes --- The spiral groove facilitates the export of metal chips, which saves time and effort in operation. Sharp flutes provide fast, neat and smooth cuts. Provides faster cutting speeds than other substrates and is harder but more brittle. Be careful and control your CNC speed. ★ K35 Tungsten Carbide --- It is a micro grain tungsten-cobalt alloy with an average cobalt content of 10%. The solid carbide drill bits has high hardness (91.5HRA), wear resistance, corrosion resistance, high strength, bending resistance and high heat resistance. ★ Useful Tips --- Keep cool and gentle when using. Not recommended for use with a hand drill (easy to shake, poor stability). If there is a problem with chip evacuation, go back in time and remove the chips. Drill metal with high hardness, the rotational speed should be slower than normal drilling.