Industry specific parts have similar characteristics as key parts but are easier to manufacture and thus there are more vendors available and less availability risk in the supply. They are still usually manufactured according to company specific drawings, but are more generic in nature (such as machined mechanical parts) and the supplier lead-time is considerably shorter. Com- mercial parts are common bulk materials such as light bulbs, screws and bolts and widely used across all industries. Several sources are available for commercial materials, reducing also the possibility of variances in the lead-times as these kinds of parts are usually also stocked at suppliers’ warehouses