This is an assorted pack of 11 different commonly used plastic gearsFeatures:Module: 0.5Middle aperture diameter: 2mmPurpose: DIY scientific small production, product design, mechanical model sample, etc.Calculation formula of gear diameter: gear outer diameter (addendum circle) = (number of teeth 2) * module.The above gears are only suitable for 2mm shafts. Including worm, spur gear, spindle gear, crown gear, double reduction gear
