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Providing an innovative solution, these self-drilling screws effortlessly penetrate through sheeting and securely fasten into purlins. With the inclusion of a sealer washer, they ensure a watertight seal around the curved crowns of cement-based sheets. Additionally, the shank™s wings create a wider hole, accommodating movement due to expansion and contraction.Features & Benefits: Roofing Superstore Baz Screw for Timber Self Drilling - Pack of 100, For use with timber sheets, Self-screws through sheeting and straight into purlin, Built-in sealer washer for watertight fixing, Winged shank for a larger diameter hole, allowing for thermal movement, Maximum sheet and purlin build-up of 65mm, Minimum sheet build-up of 30mm, 6.3mm diameter x 130mm length. Roofing Superstore Baz Screw for Timber Self Drilling - Pack of 100