PMJ-tec bi-metal fasteners for built up roof systems 7510 5.5 x 2819mm WasherColour Matched 7510 5.5 x 2816mm Washer 7550 6.3 x 2516mm WasherColour Matched 7510 5.5 x 2816mm Washer Application/Fastener Range Substrate< 2 x 1.2mm1.2 - 3.5mm1.5 - 6.0mm4.0 - 12.5mm Bracket/Liner/Profile/Rooflight751075207530Internal flashing71407110Profile/Rooflight stitch7550