They are the drill bits that come with a set like these-
https://www.amazon.com/Irwin-Tools-1882793-SPEEDBOR-Countersink/dp/B00J4NGQVG/ref=asc_df_B00J4NGQVG/?tag=hyprod-20&linkCode=df0&hvadid=241901362930&hvpos=&hvnetw=g&hvrand=11000572604821119159&hvpone=&hvptwo=&hvqmt=&...