Illustrate:The good thing about this connector is that the profile does not need to be tapped or punched, and the installation is agency It is more suitable for profiles with arcs, similar to 6630R or 8840 Suggestion:40 collection can solely be used for the European common 40 series profiles with a wall thickness of two or extra If the wall is relatively thin, the exterior thread of the threaded sleeve can't be locked and cannot be fixed Material: galvanized Recommended screws: For 20, it is suggested to use hexagon socket M4*30 screws For 30, it is recommended to use hexagon socket M5*35 screws For 40, it is recommended to use cylindrical head hexagon socket M6*40 screws For 45, it's endorsed to apply hexagon socket M6*40 screws NOTE:Avoid that the screw head is just too broad to slot into the slot