SPECIFICATIONS (mm) Model NO. d4 h3 d1 h1 20-A 18.8±0.2 3.3±0.25 13.2±0.1 8.8±0.3 20-B1 18.8±0.2 2.8±0.25 13.0± 0.1 8.5±0.3 20-B2 19.5±0.2 3.0±0.25 13.0±0.1 8.7±0.3 20-B2-1 19.5±0.2 3.0±0.25 13.0±0.1 8.7±0.3 20-C 18.8±0.2 3.3±0.25 13.2±0.1 8.0±0.3 20-C1 18.8±0.2 3.3±0.25 13.2±0.1 8.0±0.3 20-D 18.8±0.2 2.0±0.25 12.2±0.1 8.7±0.3 13-A 12.5±0.2 2.0±0.25 7.5±0.1 7.0±0.2 13-A1 12.5±0.2 12.0±0.25 8.0±0.1 7.5±0.2