Product Description Frame scaffolding coupling pin :   1. Coupling pin and spring clip is made of 35mm tubes and 41.27mm collar, used to connect frame scaffolds, with spring clip to lock. 2. Material: Q235 3. Surface finish: Electro galvanized 4. Package: bags and pallet 5. A full mason frame scaffod set is composed of 2 … Continue reading China Professional Frame Scaffolding Coupling Pin and Rivet