Display signs, posters and promotional material outdoors with this lockable and weather-resistant snap frame. The A4 display case features a strong clear plastic window with 45mm aluminium frame and rubber seals to prevent condensation and moisture damage. The case is lockable to prevent material from being tampered with, and designed to be non-reflective so material is visible even in direct sunlight. Aluminium poster frame is available in A0, A1, A2, A3 & A4 sizes.