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The EJOT Solar Fastening System has an internal drive (width across flats A/F 5mm) at the face side of the setscrew.
With this drive the EJOT Solar Fastening System can be installed / uninstalled fast and easily without special tools.

Considering the correct pre-drilling diameter (see topic: Determination of the pre-drilling diameter) the thread-forming screws will be installed fast and secure into the substructure.

Retrofitting of existing roofs can be done fast and easily by replacing the existing roofing screws with EJOT Solar Fastenings Systems.

The respective correct procedure is described in detail in the Installation Manual.

Download Installation Manual.

Link: Determination of the Pre-drilling Diameter.