There are 2 products.
Professional rck-press Bergeon n. 6173 for fitting unbreakable glasses with or without tension rings, as well as mineral glasses. Can also be used for closing pressure back waterproof cases.
Assortment of 6 POM hollow stakes Bergeon n. 6527-6CP Thread M6.Thickness 14 mm. To fit domed mineral glasses to close waterproof watch cases. To be used with presses No 6173 and No 5500.