[20Pcs/Lot] 20 Teeth 12 Teeth Bilayer 0.5 Modulus Plastic Double Gear Reduction 0.5M 20 Teeth Bore 1.95mm 2.05mm 2mm Tight/Loose

[20Pcs/Lot] 20 Teeth 12 Teeth Bilayer 0.5 Modulus Plastic Double Gear Reduction 0.5M 20 Teeth Bore 1.95mm 2.05mm 2mm Tight/Loose

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