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Thunderbolt® web for increased strength
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Open flute design for efficient chip ejection
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Faster spiral for improved drilling times
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Black and bronze finish reduces friction keeping the bit cooler
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This set offers 21 Thunderbolt® Black and Bronze drill bits ranging from 1/16 in. to 3/8 in. in 64ths increments. The bits are engineered with a thicker web and unique flute form which allows for quicker penetration and improved drilling times. With increased strength built into the web, the Thunderbolt® bit can perform many operations where conventional bits break. The open flute form ejects chips more efficiently when drilling deep holes which helps prevent lock-ups at breakthrough. Black and bronze high speed steel provides heat resistance, durability and increases bit life.
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