... 2.durable & stable 3.easy to assemble & dismantle Pressed British Double Coupler1.Dimensions:48.3*48.3mm2.Nut:21mm,22mm,23mm3 ... per your request4.Standard:EN74,BS1139,CE and also fit for our demostic stardand 5.Technic:Pressed6.Surface treatment:Self-color ... .We manufacture many kinds of scaffolding couplers no matter for drop forged or pressed.Such as swivel coupler,double coupler,girder (beam) coupler ...