Grunge BB Tool Cartridge type BB tool. Nut size: 24mm After purchasing new, used only once. There is a slight rust or stain on a part of the inside. (Probably from new) There is no problem in use. Due to shipping costs, it will be shipped by regular mail in a padded envelope. If you are willing to pay more for shipping, anonymous shipping via home delivery is also possible. (Standard home delivery) In that case, please comment before purchasing. If you purchase as is, it will be shipped by regular mail. Just in case, please purchase only if you understand that it is a used item.