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Made in the UK - Extra strong load spreading 60mm washers designed for fixing and supporting rigid wood/wool insulation boards like Savolit, Pavatex, Celenit and Heraklith, permanently in place. Made from a high density reinforced plastic with a 30% fibreglass fill to increase both strength and rigidity – 200PCS Low profile only 4.2mm when fixed (5.2mm total depth). Textured surface finish helps with the adhesion of Lime Plaster and other finishes. Colour: brown. Suitable for screw size: 4, 5 or 6mm (5mm recommended) Heat resistance (Max continuous temperature 110C, Max use temperature, short peaks 140C). Flame Rating (3mm) HB - Test method UL94. Chemical inertness. All of our products are designed and manufactured by ourselves Hawksworth Engineering in the UK, using the very latest production technology to ensure that every single part we produce meets our design brief and your requirements.