Guide stick for all Pro-Fit long / deep hole saws The guide stick is a combination stick and has both a 10 mm bracket used for hole saws from 32 mm - 152 mm. Further in on the combi stick there is also a 12 mm bracket that is for hole saws from 160 mm - 232 mm. Keep in mind that you must always make a guide hole with a regular drill. The hole should ALWAYS be 10 mm regardless of the dimension of the hole saw.