Features: 4MM to 3.175MM universal joint coupling Material: Stainless steel Color: Silver Product Range: Metal joint suited to use direct axis motor, suitable for model cars, model ships, robots, and other metal adapter to use. Size: 4mm To 3.175MM Hole Diameter: one hole diameter is 4mm,the other is 3.175MM Universal Joint Outside Diameter:9m Universal Joint Length:23mm Screw Size: M3 Package include: 1pc 4mm to 3.175MM Universal joint coupling
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