Regular Bismark Chains HMF-35 (2.0 mm – 2.0 Gr./Ft.) HMF-40 (2.4 mm – 3.5 Gr./Ft.) HMF-50 (2.8 mm – 5.5 Gr./Ft.) HMF-60 (3.2 mm – 7.9 Gr./Ft.) HMF-70 (4.0 mm – 12.2 Gr./Ft.)