... .Shape:flat semi-round 4.Grade:Ordinary Standard,10.9 5.Credible quality High strength U clamp and nutsU bolt,bolt and nuts We are the ... largest U bolt manufacturer in China ... .0mm,3.0mmMaterialmild steel,45#steel,35#steel,40Cr steel,etcHigh quality strengthgrade8.8,9.8,10.9shaperound,flat round,half-round ...