Charles was 24 mm in size, called a stag horn kidney stone. https://www.urologyri.com/wp-content/uploads/2018/04/ACF82.jpgThe one that got blasted in 2014, was about the size of a nickel and shaped like an arrow head. It took two sessions to get it all. The doctor wouldn't say that all the blood in my urine was due to that stone. I definitely think it was.
Charles refers to it as the mother of all kidney stones.