1.casting rigid torque arm for trailer 2.Delivery:15-25 days 3 ... 4.more than 20 years experience casting rigid torque arm for trailer Quality System CertificateISO 9001Dimension ToleranceCT7Surface RoughnessRa6.4 ... Analysis, Tensile Test, Dimension Inspection, Hardness TestingSurface TreatmentHeat Treatment, Machine, Polishing, Chrome, Zinc, Nickel PlatingPackingCartons, Wooden Case, Steel Cases ...