... 3.material:pressed steel/Q235 4.surface:golden/silver zinc galvanized Sleeve Coupler Size48.3 mm or 1 1/2"Weight1000 ... scaffolding couplers/clamps, such as double/fixed coupler, swivel coupler, fixed/swivel beam/grider coupler, putlog coupler, plank coupler, sleeve coupler, joint pin ... certificate.+The surface finish can be golden/silver zinc galvanized or hot dipped galvanized. Sleeve Coupler