M35 Cobalt HSS Step Drill, Four Spiral Flute Cobalt Step Drill Bit,3/16”-7/8"(12 Step Size). Impact Unibit Bit M35 cobalt high speed steel can be obtained by proper heat treatment with high hardness , high red hardness and high wear resistance. The service life is twice that of ordinary ladder drills, the drilling accuracy is significantly improved, the cutting speed is faster when drilling. TiAlN coating is a new coating material in recent two years. It has high hardness, high oxidation temperature, good thermal hardness If you are not fully satisfied for any reason, please contact us,We will provide you with Worry-free after-sales service.

• 135 °cutting angle: The increased angle of the drill tip is more suitable for drilling hard materials than 118 °. Tip-The temperature of the drill will increase due to high speed rotation. It is suggested to add cutting oil or spray water to cool the drill during continuous operation, which can effectively prolong the service life of the ladder drill. If the product has any quality problems
• After sale: If you are not fully satisfied for any reason, please contact us,We will provide you with Worry-free after-sales service

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Common questions