Triple layer window frame kits.
Laser-cut from two layers of 1mm white Rowmark with a 0.75mm top frame..
You will require a good quality solvent to glue the layers together.
The measurements given are the opening size required. The windows have an additional border round them so the overall size is larger.
These sash windows are available as closed windows or with the bottom sash shown in an open position.
Cutting templates and brick / stone headers are available for these windows.