To fasten components to profiles. Breaks the anodized coat of the profile - thus ensuring a safe, electrical conductive connection. For use in 40 series slot 8 extrusions Item-Type. Available in M4 (equivalent to 8020 - 13028), M5 (equivalent to 8020 - 13027), M6 (equivalent to 8020 - 13031) and M8 (equivalent to 8020 - 13034)