21/64" stub drill bit, 1 3/4" flute length, 3 1/6" overall length. 5/16"" stub drill bit, 1 3/4" flute length, 3 1/6" overall length Long drill bits tend to wander if they hit tight wood grain causing off-center holes. $4.50 each s/h Made in the USA

Use 21/64" bit for hard wood and 5/16" bit for soft wood