Feature●Product Name: Coupling Joint; Material: Copper●Size: 20mm x 9mm/0.8" x 0.35"(L*D); Type: 4mm to 4mm●Side Thread Diameter: 2.5mm/0.1"; Fixed Type: Clamp●Main Color: Gold Tone; Net Weight: 9g●Package Content: 1 x Coupling Joint, 5 x Screws, 1 x L BarDescription
-The coupling is great for connect your motor of 4mm to 4mm shaft to the wheel. -Can be used in electric car toy, robot, etc.