13 PIECES PROFESSIONAL COBALT TWIST DRILL Instructions for Use - When working with manual drills, pay attention to the rotation speed adjustment, the drill bit is easily damaged if the rotation speed is too fast. - For metals with high hardness and many impurities, the speed is slower than normal drilling, and the cooling effect is better. - Do not knock when using this product, the work needs to be fixed, and the swing of the work during operation will break the drill. 1mm-2mm | 3000-1800 giri / min 2mm-3mm | 1800-1400 giri / min 3mm-4mm | 1400-1000 giri / min 4mm-5mm | 1000-800 giri / min 5mm-6mm | 800-700 giri / min 6mm-7mm | 700-600 giri / min

No Center Punch Is Needed:The 135° Quick-Cut points are self-centering and penetrate quickly with less pressure. Twist drill bit kit Will not "walk" or "wander"

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