（6“ 高速金属钻）6" High Speed Steel Aircraft Extension Drill Bit

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-- High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
-- Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge
-- Round shanks allow use with a wide variety of tool holding systems
-- When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging

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