The inverted KDSI-SR screw frames enable a complete assembly from the outside. The design and the simple, established assembly principle remain practically unchanged. The changes to the inverted versions are the new mirrored geometry of the frame's opening tapers and an additional two-part protective hood, which ensures the tight fit of the sealing elements towards the outside. The safe IP66 seal and the reliable static strain relief in accordance with DIN EN 62444 is further ensured by the integrated frame gaskets and the conical shape of the sealing elements, which are pressed into the frame openings from the outside.