Steel Grade: SAE1060, SAE1065, SAE1070, 60#, 65#, 65Mn, 70#, 72A, ... 20mm~12.00mm 1. Product Name: High Carbon Steel Wire, Spring Steel Wire, High Carbon Spring Steel Wire, Carbon Steel Wire, Spring Wire, Mattress Spring Wire, ... Spring Wire for Mattress2. Material:Steel GradeGB StandardCarbon% ...