uxcell 62Pcs 62 Styles Plastic Gears All Module 0.5 Robot Parts for DIY Toy

Such as double-gear 2610-2B is the outer 26 teeth, within 10 teeth, aperture 2mm tight fit
A tight with small 0.05mm aperture than standard B said loose with than the standard aperture 0.05mm 
Calculate the gear diameter: 
(Number of teeth +2) * modulus = gear diameter
Gear modulus of the package: 0.5 Aperture: 1.5, 2, 2.5,3
Modulus: 0.5 Aperture 1.5, 2,2.5,3
The mainshaft gears :8-1 .5A 18-2.5A18-3A 82A 10-2A-2A 16-2A 9-2A 12-2A
Crown teeth: C202.5A C24102Ac24102b C30102B C20-3A C28-2AC30-3A C3610-2B C2810-2A C20-2A
The monolayer Gear: 202A 262A282A402A522.5A 563A24-2.5A 36-2A 38-2A 38-3A 44-2A 44-2.5A 48-2A 46-2.5A 50-3A56-2A 422A 30-2A
Double gear:18102A 48122.5A 4610-2B 4810-2B 2610-2B 2210-2B 3212-2B 2810-2B 3808-2B 2810-2B 3210-2B2808-2B 3412-2B 3610-2B 5010-2B 4410-2B 5610-2A 3010-2B 2410-2B
Worm: 6 * 6 (diameter 6mm * length 6mm), 6 * 8 (a diameter of 6mm, and a length of 8mm)