GENUINE ONDULINE Roof Sheet Fixing Nails / Screws COROLINE CORRUGATED BITUMEN. Box off 400 (smaller quantities available) These Onduline roof sheet fixings have been designed with an unobtrusive 18mm head in a range of product-matched colours, making them simple and easy additions to your chosen roof. Fixed with an Onduline smart sealing head with UV stabilization, these easy-to-use fixings sport a polished galvanised steel nail in 65mm. Coming in a range of economical pack sizes and colours, these fittings are perfectly paired for Onduline roofing projects. These fittings come in a smart, deep black colour. Colour Black Material Galvanised Steel Pack Size Pack of 400