[Features] Equivalent to the new JIS level 9 to 10. Module 0.5, pressure angle 20° (parallel teeth). Number of Teeth: 3.1 inches (80 mm); Reference Circle Diameter: D: 1.6 inches (40 mm); Tooth Width: 0.08 inches (2 mm); Hole Diameter: 0.1 inches (3 mm); Weight: 0.8 oz (24.1 g); Country of Origin: Japan