Combined drill and countersinks from Grainger can help you drill and countersink in one step to help save time and increase productivity. A high-speed steel bit can be used for drilling and countersinking screws in steel and other ferrous materials. Choose a countersink drill bit with a titanium coating to help increase life, lubricity and toughness. Combined drill and tap countersinks with back tapers can prevent over-drilling. Trust Grainger to provide high-quality countersink drill bits!