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The drill bits are made from HSS (hi-speed steel) in a bright finish. The drill bits are fully precision ground at 135°with a split point. The drill bits can also be used to drill either woodor metal.
The drill bits are re-sharpenable several times. We recommend the followingmachines as it will sharpen 135° HSS split point drill bits with ease:
TIP:
When drilling hard metals, always use a coolant/lubricant. We recommend usingCT-90.