... parts1,Name: Steel forging auto parts;Steel auto parts;Forging auto parts 2,For the similar auto parts,what can we do ?1), ... Ability for the material of this kind of auto parts ... Grinding and polishing,etc,except mirror finish (3),Ability for the tolerance Roundess0.002mmCylindricity0.003mmRoughnessRa0.32Straightness0.01/200mm 3, ...