For the longest while I kept a tapered countersink drill bit chucked up in the Jacobs and swapped back and forth to pre drill and install screws in cabinets. Works well enough, love the CXS for most applications. Just got a C15 and I'm having issues letting the little drill go. For drilling pocket screws and using bigger bits though, C15 and the 1/2" Jacobs is clutch.