TFHH5551 TECHFAST HEAVY/SEC METAL ROOF SCREW 5.5 X 50MM WASHERED [BOX-100]
Forgefix TechFast Self-Drilling Stitching Hex Screws are used to join metal roofing sheet panels together. They are self-drilling up to 2.5mm. The smaller No.1 drill tip can drill through 2 sheets then engage the threads to clamp the sheets together under the head.