"After spending considerable time finding an acceptable solution for attaching metal corrugated sheets onto my shed roof, I came across these. I went to the shop and asked the assistant to bring out a bag as well as a bag of 4 mm stainless screws to check the match. They were all too kind and within 2 mins the stuff was out for inspection. These parts matched the 4 mm screws very well, could have gone bigger still but 4 mm was a good size. These deform a bit when torqued down and squashing the rubber gasket but I have no doubt they will seal well against rain and the other feature I liked was that the rubber will not damage the zinc plating on the shed roof, unlike some solutions including washers, so all in all love this product, it's just right for my job."
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Review 2 for Rawlplug Aluminium Washers M19 x 2.07 x 3mm 100 Pack