1. Materials used large cast aluminum parts. The door used standard 105*55, Thickness 1.5mm (Actual thickness). Indirect materials used to increase the solid core aluminum material can withstand the weight of 4 ton no distortion, no fracture. Using new 50 large pulley groove with special aluminum materials and widened solid core aluminum tires for security.

2. Door design: Optimum height is 1.88 m. Solid cast aluminum door skates with luminous reflective effect. Preferred choice for major enterprises and office spaces.

3. The bottom of the door body is widened to more than 1 meter. Compact structure and uniform force allows bearing weight of 4 tons. Die-cast aluminum radiator overall intensity ensures high working pressure and stability against snow storms.

Surface treatment: High-pressure die-cast aluminum with ultra high-speed filling. Surface degreasing and oxidation coating ensure long-term non-shedding, impact resistance, and corrosion protection.