Hi,
I wanted to get a second drill bit for my Jessem 08300 doweling jig setup so I wold not have to keep switching the collar. I looked at the parts list and it said 9.7 MM bit. So I ordered a 9.7 MM and a 3/8th collar. I received all the parts then drilled out the collar for the 9.7 MM. I went to put the drill bit in to set it up and it would not fit. The bushing and the drill bit that came with the kit are 3/8ths. I should have looked at the bit. So all this leads to the question what size should it be.