1.fixed scaffolding couplers 2.Diameter:48.6mm. 3.Material:SPHC, 4.Used on scaffolding 5.thickness: 3mm 1.fixed scaffolding couplers2.Diameter:48.6mm.3.Material:SPHC,4.Used on scaffolding 5.thickness: 3mm Production nameMaterialSizeFixed Scaffolding ClampsSPHCDiameter: 48.6mmSwivel Scaffolding ClampsSPHCDiameter: 48.6mm fixed scaffolding couplers