Step Drill Bit,9 Steps Size Four Spiral Flute M35 Cobalt Step Core Bit with 1/4" Quick-fit Hexagon Shank Hole Saw for Metal,Stainless Steel,Aluminum,Wood, Plastic, Copper

Step Core Bit

• M35 Cobalt HSS Step Drill Bits is suitable for drilling Metal, Stainless Steel, Aluminum, Wood, Plastic, Copper and other similar materails.
• 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.
• Application: Suitable for all tiles, marble, artificial stone, granite, stoneware and quartz,wax inside the drill bit, dry Diamond drill bits are worked great, using water could prolong the lifetime