The included blow-molded box makes transportation and organization easier than ever! Size of 4 pairs of stepped adapters： 35, 40, 45 mm (1.38″, 1.57″, 1.77″); 50, 55, 60 mm (1.97″, 2.17″, 2.36″); 65, 70, 75 mm (2.56″, 2.76″, 2.95″); 80, 85, 90 mm (3.15″, 3.35″, 3.54″).