No it's at a 45 degree angle . There's no need for a drill bit , I use an atomizer filled with laquer thinner and just blow it right through , let it set for 5 min. and blow some more through . clean the bore last . You can purchase a 16 oz atomizer from a co. called Sure-Shot and they are the cats pajamas for gun cleaning . Put in the solution that you want to use , charge with air , and you can put fluids where you never could before . Of course there's always good old Brake cleaner too !