Adam Hall makes functional and durable products at affordable prices. This also goes for these rack screws, but unfortunatly I never got to try them out. I ordered them for my before knowing out that there is no standard rack screw size, and these do not fit my rack. Apparently, there are three different types of rack screws (not taking length into account) for racks with pre-threaded rails, as well as rack screws with cage nuts for racks with un-threaded rails. Make sure what kind of screws are needed for your rack before ordering!