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Construction fastener is the core connection component of construction engineering, which is mainly divided into three types: right angle, rotation and butt joint, and adapts to different connection requirements of steel pipe. It is made of cast iron or steel by standardized process, and has the characteristics of anti-skid, anti-rust and anti-falling, and is easy to install and disassemble. It is widely used in scaffolding, bridges and other structures, providing key guarantee for construction safety and structural stability, and is an indispensable basic accessory for engineering construction.