prestressing thread steel bar 1. Standard: GB/T 20065-2006 ,DIN 2. Diameter: 15,20,25,32,36,40M 3.Material:40Si2MnV screw-thread steel bars1. Standard: GB/T 20065-2006 ,DIN2.Material:40Si2MnV3.Diameter: 15-40mm 4. Length: according to customer's requirements5.Grade:PSB785,PSB830,PSB930,PSB1080,JL540,JL8006. Packing: in bundles prestressing thread steel bar