There are several jigs available. I bought mine from Woodcraft and am happy with its performance. I chuck up the drill for drilling the blank, then lower it so I can close the jigs jaws on the drill bit--now it is centered. Then I use a clamp to hold the jig in place. My first drill press was small and I'd have to unclamp the blank, raise it, reclamp and finish boring; time consuming but it worked.