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4-Pack 7mm Flexible Coupling Connector for Any Motors with Shaft Diameter of 0.275in/7mm - Car Wheels Tires Shaft Specification Material: Brass Side length: 7mm/0.275 inch Diagonal: 0.535''/13.6mm Hexagon width: 0.472 ''/ 12 mm Height: 0.708 ''/18mm Cylindrical outer diameter: 0.452 ''/11.5mm Side thread: M4 Bottom thread: M4 Applicable machine shaft: 7mm Dimension:18 x 11.5mm/0.71 x 0.45"(L x Dia) Application Coupler copper shaft coupling for the automotive tires DC motor robot car. Package include 4 x Hexagon motor flexible coupling 2x Allen Wrench 8x Screws.