The second level quality part. It is of average miles and normal condition for its age.
The third level quality part. It has high miles and/or light damage. A part that has not yet been graded. A category is a way of classifying a part in inventory. The category appears as a one-letter abbreviation under Part Detail.
Used part, loose and unbolted from vehicle. Used part, still on vehicle. Used part that is rebuilt or reconditioned. Used part for which too many are available.