Sleeve couplers will be used to connect two scaffold tubes in line.pressed type material :Q235 thickness: 5mm weight: 1.07 kg Sleeve Coupler1,material : Q235 2,Standard:EN74 3,for tube o.d. 48.3mm x 48.3mm 4,thickness: 5mm 5,weight: 1.07 kg 6,surface treatment: zinc plated, yellow passivated7.Color: White, Yellow scaffolding coupler sleeve coupler