Steel U Bolt: Material:Stainless Steel,Steel. Surface Treatment:Polished.Zinc Plated,Mill. Sizes per customer's request. Steel U-bolt Material:Stainless Steel,SteelSurface Treatment: Polished.Zinc Plated,Mill Model Number : M6-M39 or according to customer's requests. standard : DIN,GB,JIS,ANSI and ISO Grade:4.8,8,8.8,10.9 Specialized in producing all specification stainless steel and steel U ...