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Description:
This type of screw is used for fastening metal sheets in roof construction. It is manufactured by plastic deformation from carbon steel with a zinc-coated surface, and is fitted with a steel washer and EPDM rubber to prevent water ingress. The screw features a fine thread pitch and a normal tip, capable of drilling through thin sheets precisely; thus the fastening operation does not require pre-drilling, facilitating the process and avoiding potential damage. The hex size for the screw with a diameter of 5.5 and a length of 50 mm is 8 mm.