... and resistance to oxidation ,the surface need galvanized ,PVC coated .Widely used in Construction,Coal Industry,Chemical,Metallurgy ,Machinary ... 4.0,5.0,6.0 Surface treatmentHot galvanized+PVC coated (Anti-corrosion Available >10 years) Connection modeStandard: hook ... length20-25 Color seriesCommon color:red,yellow,blue,green,white,black,gray;Optional color:RAL265 colors Installation wayC20 concrete ...