Flat Victorian Chains V-40 (1.2 mm – 1.7 Gr./Ft.) V-50 (1.5 mm – 2.5 Gr./Ft.) V-65 (1.8 mm – 3.6 Gr./Ft.) V-85 (2.6 mm – 7.9 Gr./Ft.) V-100 (3.1 mm – 10.3 Gr./Ft.)