Circular arc horizontal bending and circular arc porous horizontal bending are the core horizontal turning accessories of cable tray systems, which are compatible with the full range of tray specifications such as groove type, ladder type, and tray type. They are widely used in various strong and weak electrical wiring projects such as municipal electromechanical, industrial plants, commercial buildings, data rooms, etc., to meet the construction needs of horizontal line reversing, positioning avoidance, and regular wiring. Both accessories adopt a smooth arc-shaped integrated structure, replacing traditional right angle elbows, making the cable turn more smoothly, effectively preventing cable outer skin wear and deformation, comprehensively protecting the circuit structure, and improving wiring stability and safety. The circular porous horizontal bend is equipped with uniform breathable fixing holes for better heat dissipation performance, which facilitates on-site positioning, installation, reinforcement and fixation, and is suitable for dusty and long-distance wiring scenarios. The product has standardized dimensions, tight connections, easy installation, and neat wiring without dead corners, making it easy for later inspection and maintenance as well as line renovation and upgrading. It is a commonly used accessory for fine electromechanical wiring.