4pc Super Sonic Premium Silver and Deming Drill Bit Set 1/2″ cut down shanks allows for use in any drill with a 1/2″ chuck. Special Hi-Molybdenum tool steel. This is a professional grade set. 135 degree split point for extremely fast penetration with an accurate starting point, this drill requires no center punch prior to drilling. Precision ground point from top to toe for the ultimate in accuracy and performance. Body and clearance are gold surface treated for maximum lubricity, with 3-flats on a 1/2″ shank. These are heat treated at 2185° F and then nitro-carburize finished at 950° F to be measurably harder than high-speed steel. Nitro-carburized steel withstands substantially higher drilling temperatures while maintaining sharpness. Recommended for use in work hardening grades of stainless steel and other hard metal drilling applications. Set includes 9/16″, 5/8″, 3/4″ and 1″. Proudly Made in the USA
