Product details:

To store, organize, and transport up to 40 router bits. Designed to hold 8mm (5/16") shank bits and 12 mm (15/32") shank bits. 1/4shank bits may be stored with a loose fit, while 1/2shank bits may have a more snug fit. Protect router bits and easily transport. Keep router bits organized. Latch Systainer to others and transport at the same time. With foam insert. For safe storage of cutters D 8, D 12.