With the Wiha 79186B5 countersink bit set, you achieve smooth, chatter-free countersinks and burr-free edges in wood, metal, and plastic. Ground hss steel ensures clean chip removal so that screw heads sit completely flush with the material surface. The standard 1/4" hex drive allows fast and effortless bit changes in your drill or cordless driver during assembly or maintenance tasks. Featuring five versatile sizes from M3 to M8, you always have the right tool at hand, neatly organized and protected in the included compact plastic storage box.