The Lerice roller system has a 40mm deep cassette which holds 2.6 metres of fly mesh, this enables the largest of windows and doors to be screened. The Scilla has a 30mm deep cassette which makes it ideal for narrow depth windows especially in caravans. This system can be fitted with stop grips along the side guides so the mesh can be extended to various points. The Scilla system holds 1.5 metres of mesh and is suitable for windows.