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Lightweight Excavation Shoring Box with High Strength Q235 Steel Construction. Made of thick Q235 steel, high load-bearing capacity to prevent trench collapse. Slide rail design for fast assembly & disassembly, greatly improve construction efficiency. Reusable & sturdy, lower comprehensive cost for long-term engineering projects. Custom sizes available, complete load test reports for construction safety compliance. Multiple light/standard/heavy duty models for cost-effective selection.