Keylite flashing kits are the most efficient way to ensure a watertight installation for your windows and have been designed to integrate efficiently with specific roofing materials. The installer-friendly instructions and one-piece bottom apron ensure easy first time fitting. Keylite also manufacture combination flashings. The Keylite range of combination flashing systems allows any of the standard Keylite Roof Windows to be installed in vertical, horizontal or group blocks.