YDuupxe Reduction Gears - 19pcs

Specifications: Material: Plastic Color: White Modulus: 0.5 Thickness: 4~5mm Type: 16102B, 18102A, 20082B, 20102B, 22082A, 22102B, 24102B, 24122B, 26082B, 28102B, 30122B, 30162A, 32082B, 34102B, 38082B, 40102B, 46082A, 48102B, 50102A 1. The first and second number is outer teeth number 2. The third and fourth number is inner teeth number 3. number is aperture diameter 4. 2A means center shaft is 1.95mm and close-fitting with 2mm shaft. 2B means center shaft is 2.05mm and loose-fitting with 2mm shaft. 5. Gear outer diameter=(teeth number+2) x 0.5mm e.g. 16102B means 16 outer teeth, 10 inner teeth, aperture diameter is about 2mm and loose-fitting 2mm shaft. Gear outer diameter=(16+2) x 0.5mm=9mm. Weight: 9g(approx.) Package Includes: 19pcs x Gears