ITEM NAME:Round Single Chrome Universal Steering Shaft U Joint Couplers Description: 100% Brand New and Not Been Used. Made of metal,durable. Fitment:Brush-less motor rc boat use. Ideal accessories for RC Model motor, such as airplane boat model. Metal joints for use in direct-axis motor, motor for the brush motors and small brush-less motor. Specification: Material: Metal Color: Silver Quantity: 2PCS Side hole threads: M4 Overall Length: 35mm/1.38inch Package Includes: 2 Pieces Universal Couplings(Including Mounting hardware) Note: Please allow 0.5-1 inch difference due to manual measurement. (1 inch=2.54cm) The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding..Side hole threads: M4. 2 Pieces Universal Couplings(Including Mounting hardware). Ideal accessories for RC Model motor, such as airplane boat model. Color: Silver.