Quality high speed steel drill bits available in mechanics length. High speed bits 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 which is used to identify cobalt steel tools, performance is similar to uncoated tools. The round shanks have flats ground onto three sides to reduce slippage of the bit when used in drill chucks.
Printable Drill Bit Sizing Conversion Chart