Fixing buttons are used in conjuncion with polycarbonate sheets to keep the sheet in place. These fixings are usually used in conjunction with larger sheets and should be fixed through to timber rafters.The buttons consist of a screw and a cap inside a larger PVC circular housing which spreads the pressure and forms a watertight seal, these can also be used as a precautionary measure to avoid sheet slippage on installations.Fixing buttons are available in a box of 10 and available in both white and brown and for 10mm, 16mm or 25mm sheets.