Made of special hi-molybdenum tool steel.
Heat treated at 2185 degrees Fahrenheit and then nitro-carburized at - 950 degrees
Measurably harder than standard high-speed steel
Feature a 135 degrees split point for faster penetration and accurate starting without a center punch
The body and clearance of this bit are “gold surface" treated for maximum lubricity
Designed for drilling in harder steels such as stainless
Less brittle than a cobalt bit, so you will not have the problem of chipping
They have ½” shanks (can be used in a ½” keyed chuck drill)
The shanks are flatted to prevent slipping
 
 
Product ID:
3640 - 9/16” Black & Gold Bit
3641 - 5/8” Black & Gold Bit
3642 - 11/16” Black & Gold Bit
3643 - 3/4” Black & Gold Bit
3644 - 13/16” Black & Gold Bit
3645 - 7/8” Black & Gold Bit
3646 - 15/16” Black & Gold Bit
3647 - 1” Black & Gold Bit