Tight Cable Chains F-30 (1.1 mm – 1.2 Gr./Ft.) F-40 (1.5 mm – 2.4 Gr./Ft.) F-50 (2.0 mm – 3.8 Gr./Ft.) F-65 (2.5 mm – 5.5 Gr./Ft.) F-85 (3.3 mm – 10.3 Gr./Ft.) F-100 (3.7 mm – 12.0 Gr./Ft.)