HSS-E 8% Co + Red'X = hardness 67 HRC, to machine steels up to 1300 N/mm², abrasive tough steels, stainless steels, titanium alloys, hard bronze, inconel, nimonic, waspaloy, hard cast irons. The Red'X coating = hardness 3500 HV, considerably increases the tool life for intensive use, by increasing wear resistance and improving surface finish.

These short drills are specially designed to be used with revolver-handle pneumatic disconnectors.  
Flated shanks with 60° taper for a good location in the disconnector.  

The centering point grants perfect drilling without any deviating.  Thanks to the special sharpening the first sheet will be bored without damage for the second one.  Their design allows an excellent penetration, a high resistance to the wear and a great many regrinds.