Please note these sheets are fixed with baz washers. Properties Thickness: 6mm. Corrugation Height: 51mm Wavelength (distance from the top of one corrugation crown to the top of the next): 177mm Sheet width: 1097mm Sheet coverage width: 973.5mm (an overlap each side of half a corrugation) Colour: Clear. For spanning centres see diagram Corolite CST polycarbonate sheet provides the durability and impact resistance of corrugated polycarbonate sheet with additional strength and insulation provided by the triplewall structure. Added UV protection provides resistance against the effects of weathering. Can be used with fibre cement sheeting or as a complete roof and wall cladding material. Features Excellent light transmission, damage & impact resistant, optically clear, insulating, lightweight and easy to handle. These sheets come with a 10 year light transmission warranty and a 3 year weather breakage warranty. This product also has excellent fire performance. The Corolite range by Ariel comes with a 10 Year Guarantee.