Subject: What is most common column type with dimensions and particle size in HPLC?

I have been working on various aspects of High Performance Liquid Chromatography
(HPLC) during my graduate study, but the above question has been intriguing me
for quite a while now, as this is a very generalized and narrowed down question.
After all, what is the most common used column type, column dimensions and
particle size in High Performance Liquid Chromatography? I request you to help
me with this question. Thank you very much.

Re: What is most common column type with dimensions and particle size in HPLC?