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Single layer gear, additionally known as spur gear, is simple and direct transmission, and most of the shafts are heavily matched. Gear outer diameter=(number of teeth+2) * 0.5 (unit: mm) For example, 32-2A signifies that the variety of enamel is 32, hole diameter 1.95mm. A indicates that it's heavily matched with the 2mm shaft. If it is B, it ability it is loosely matched with 2mm shaft. Product Description: Name: Plastic Shaft Single Layer Gears Model: 0.5M Material: Plastic Used:Do DIY science and small production, product design, mechanical model. Remarks: If you've particular needs, please touch us, we are able to customize according to your needs! The records is measured manually, for reference only, please talk over with the genuine object! Package Include: According in your Choose!