1 Level
798 Review
44 Karma
Review on π οΈ Cobalt Twist Drill Bits 6.5mm: Premium Quality and Precision for Efficiency by Bobby Frazier
For drilling class 8 bolts in a caterpillar of a bulldozer
You are perceptive and honest. They have cobalt in the metal, making them prone to edge cracking when they touch the last part of the cut. If you use a hand drill, this is what you expect. I was able to pierce the track bolts (grade 8) on the main link. If I had paid close attention to the pressure I was putting on the drill I would not have had any problems with the cutting edge breaking. I've never broken anything other than the cutting edge which was my fault overall, especially for the price.
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- Parts and accessories for electric drills
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- There are other interesting options.
