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Material: Iron PlatingMetal joint fitted to use direct axis motor, appropriate for model cars, model ships, robots, and other metal adapter to use."10mm-12mm" ability "one hole diameter of the coupler is 10mm ,the different is 12mm"Universal Joint Outside Diameter: 20mmUniversal Joint Length: 52mmSide Screw Fixing Hole: M5Package Included:Universal Joint x 1Screw x 4Spanner x 1