A set of universal drills for Metal by STHOR 22640 Made of durable and high -speed HSS steel They allow you to make precise holes in hard alloy steels, aluminum, sheet metal and PVC. • Nitride -covered surface • The conical profile facilitates drilling and centering • The edges of the drilled holes remain clean and without burrs • Includes: reliever, cone coil, gradual drill and milling drill.