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Product Name: Metal Tow-section Universal Joint Coupling Material: Iron(plating) Product Description: 10x10mm: each side are 10mm holes, would be inserted and stuck with shaft or motor of the corresponding size and diameter. Scope of use: motor, immediately shaft, compatible for mannequin cars, model ships, robots and other steel adapter. Note: Buy one universal joint coupling will ship 2pcs M4 machine rice screws. One wrench according to customer. Pack Quantity: 1Pcs