This Set of Gear Tooth Gauges is meant for measuring Diametral Pitch (Inch)/Module (Metric) and 14.5/20 degree Pressure Angle gears. Set contains: 1x - Diametral Pitch (Inch) 14.5° Pressure Angle 1x - Diametral Pitch (Inch) 20° Pressure Angle 1x - Module (Metric) 14.5° Pressure Angle 1x - Module (Metric) 20° Pressure Angle Manufactured in the USA. Material is 4.5 mm thick thermoplastic.