Modern Manual Roller Shutter Door Spring Box for Factory Sale

Modern Manual Roller Shutter Door Spring Box for Factory Sale. Durable Material Construction: Made of general Q235 steel plate ensuring high quality and durability. Rust Resistant Surface: Bright galvanized silvery surface treatment resists rust effectively. Multiple Size Options: Available exterior diameters: 200mm, 220mm, 240mm, 260mm. Various Interior Diameters: Interior diameters range from 42mm to 76mm including 42, 43, 48, 50, 60, 76mm. SGS Certified Product: Product has passed SGS certification for quality assurance. Comprehensive After-Sales: Free replacement for defective products caused by manufacturer. OEM and ODM Capability: Custom production available since 2007 based on samples or 3D drawings. Secure Multi-Layer Packing: EPE bag, poly bag, hardboard box, and 5-layer master carton for protection.