1. multiple color 2. multiple aluminum series 3. multiple surface treatment 4. easy to install 5. safty lock Sliding aluminum door and window are prefect for outdoor, keep an safe place for you.1. Aluminum alloy50,56, 70, 80, 85, 90,100 Series...2. Opening style: fix, sliding, casement, awning, sliding-hung, thermal break, etc3. Treatment: painting/powder coating (provide multiple color), ...