Drillco 350N Series Nitro 13 Piece High-Speed Steel Mechanics Length Drill Bit Set, Black and Gold Oxide Finish, Round with Flats Shank, Spiral Flute, 135 Degrees Split Point, 1/16" - 1/4" in 1/64" increments

Product description

• High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance
• Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools; performance is similar to uncoated tools
• These round shank tools have flats ground onto three sides to reduce slippage of the bit when used in drill chucks
• When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging
• 13 screw machine length drill bits ranging in size from 1/16" to 1/4" in 1/64" increments