This is the same stepped bit supplied with Kreg 300-series pocket-hole jigs, available on its own to use as a spare or to replace a worn bit. Compatible with all current and older-model Kreg pocket-hole jigs that use a 3/8" bit (i.e., not for use with heavy-duty or micro-pocket guides), the 6 1/4" long HSS bit has a 3/16" diameter by 1/2" long pilot, a 3/8" diameter counterbore, and a 1/4" hex shank that’s grooved for use in quick-change chucks.