Spring Steel Steel grade: GB 60Si2MnA, 30Si2CrVA, 60Si2CrA, 50CrVA, 50CrV4, 51CrV4 JIS SUP6 / SUP7, SUP10 ASTM 9260, 6150 EN 61SiCr7, 54SiCr6, 51CrV4 Diameter: 12mm-130mm