... 2.thickness:3.5mm 3.material:pressed steel/Q235 4.surface:golden/silver zinc galvanized Sleeve Coupler Size48.3 mm or 1 1 ... forged and pressed scaffolding couplers/clamps, such as double/fixed coupler, swivel coupler, fixed/swivel beam/grider coupler, putlog coupler, plank coupler, sleeve coupler, joint pin, single coupler, etc ...