Thank you for your reminder, and I am very sorry for the bad shopping experience. Regarding the problem of using screws for heavy industrial rails, because industrial rails have a wide range of uses, the ways to fix the rails are different, some are directly welded, some use self-tapping screws, some use nuts and screws, and the length of the screws is different. It is not the same, so we cannot achieve unity, so there is no match.