For carbide tipped blades, it is very important that the carbide tips don't touch or they will chip. So it's important that the heavy blades come with a rugged case to store them in. With this product, the case does not hold the blades properly; it is flimsy and cracks easily as noted by other reviewers - the blades are held apart by a thin layer of cheap, very fragile plastic that crumbles with the slightest movement of the heavy blades. Also, the metal shims are corroded.