M35 Cobalt Step Drill Bit, DARTOTEK 1/4 Inch-3/4 Inch 9 Steps Size Four Spiral Flute Step Core Bit with 1/4 Inch Quick-fit Shank Hole Saw for Metal,Stainless Steel,Aluminum,Wood, Plastic, Copper
118° Split Point provides self-centering and prevents walking and Four Spiral Flute provide faster and soother drilling,like cutting butter.
TiAlN Coating With 89HRC surface hardness, can cut harder materials and achieve higher cutting speeds and be Heat resistant, wear-resistant, and corrosion-resistant.
Suitable for Hand electric drill, bench drill etc; the recommend speed is 2000-5000RPM; if cut softer materials, the recommend speed is 1000RPM; Don't use impact and hammer modes. It is recommended to use cutting oil or water cooling during continuous cutting to greatly extend the service life.