I have tapping bits for sale. Identical to the competition with the 90 degree cutting head. However, they are 4-1/4" long with a long flute for use in the precision tapper. The other bits offered are too short to be properly used in the precision tapper. They are direct fit for any other drill. We have had issues using the short bits with the precision tapper as in a thick barked tree they are not long enough to get a 2" tap depth. Limited quantities available $12/each.