sololoop straps measurement

hi, I go swimming every day, and use my Apple Watch series 7 for workouts. at the moment I'm using a solo loop straps from https://www.sololoopstrap.com. 170mm to 190mm solo loop band/straps large size https://www.sololoopstrap.com/products/sololoopstrap?_pos=2&_sid=19b2aa37f&_ss=r. but the wee silver pins keep coming out and need to put them back in. was looking on apple website for solo loop bands, but there is no measurements beside each number size.

before I got from solo loop straps, I did buy from apple, done a writ measurement and said I needed size 9, but when I got it it was very very tight on my wrist so sent it back for refund. does anyone have measurement sizes etc for apple website ?

thanks in advance