Drillco 350N Series Nitro 15 Piece High-Speed Steel Mechanics Length Drill Bit Set Black and Gold Oxide Finish Round with Flats Shank Spiral Flute 135

Drillco 350N Series Nitro 15 Piece High-Speed Steel Mechanics Length Drill Bit Set Black and Gold Oxide Finish Round with Flats Shank Spiral Flute 135

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 15 screw machine length drill bits ranging in size from 1/16" to 1/2" in 1/32" increments