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This is a kind of universal double transmission gear, to meet your DIY needs, it contains 19 size, you can freely combine them.
The hole is loose and tight, you can refer to my table.
We have more gears and motors in our srore.
Size: Please refer to my table
Contain: 19pcs Gear
Material: professional engineering plastics
Specification: 19pcs/lot General Plastic Gear Set
14 reviews for 19pcs/lot General Plastic Gear Set