Sell Spot double-layer large gear plastic stack gear 0.5 modulus reduction rack drive DIY toy model multi-specification card model best price

Model note: 1. The first two digits of the code: the number of external teeth of the gear 2. Code three or four digits: the number of teeth in the gear 3. The fifth digit of the code: the bore size of the gear 4. Coded English: A: tight fit B: loose fit 2A indicates that the central axis is 1.95mm; It is tightly matched with the 2mm optical axis and rotates with the optical axis. 2B indicates that the central axis is 2.05mm; It is loosely matched with the 2mm optical axis and rotates freely on the optical axis. ① We ship goods from overseas, delivery time: 2-3 days after the normal bidding, 15 days to receive, if special circumstances will be notified. ② The products are all taken in kind, not captured on the Internet. Please don't worry about the quality and quality. Color difference is inevitable due to problems such as display or shooting lighting. Please inquire clearly before purchasing. You will check carefully before shipping. The thread ends are not defective! Quick delivery within 36 hours from the spot, about 20-30 days waiting time in case of shortage.