2MM Plastic Worm Reduction Gear 0.5/0.6/0.8/1M 7.2mm*12.5mm DIY Model Toy Spiral Accessories worm wheel 6/7.2/8/8.5mm Diameter

2MM Plastic Worm Reduction Gear 0.5/0.6/0.8/1M 7.2mm*12.5mm DIY Model Toy Spiral Accessories worm wheel 6/7.2/8/8.5mm Diameter

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