I recently was able to acquire a Kress 1050, it is what they call a milling motor and it came with a single 8mm collet. I am trying to find out which kind of ER collet it requires since the included manual is very poor in documenting this.

I took some measurements of the 8mm collet and the lenght is 26mm with an OD of 14.6mm. Looking at the ER16 collet spec it shows a lenght of 27mm and OD of 17mm close but not a match in my opinion.

Seeking advice or information on which kind of ER collets I would need for this kind of tool.

Thanks for your time and reply.

Carlos