3mm to 3mm Coupling Hub Hello Customers, we would like to inform everyone that we will not be accepting orders until we fix the issue of disappearing shipping cost from your orders. We are still investigating and fixing the settings so that the correct shipping cost will be displayed in every order. Thank you very much for understanding » All Products » 3mm to 3mm Coupling Hub This copper coupler can be used for connection of 3mm to 3mm shafts of RC toys, boats and helicopters. SKU: OTH27407972788 Price: 0.99 $ Product in stock SSL Certificate Quantity Updating cart... This copper coupler can be used for connection of 3mm to 3mm shafts of RC toys, boats and helicopters. Specifications Length: 20 mm Inner Diameter: 3 mm Material: Brass Related Products Proximity E3D v5 3D Printer Head (0.3 mm nozzle, 3 mm filament) GY-ADS1115 ADC Module CMSIS-DAP JTAG Adapter for ARM with Case 5pcs LilyPad Pixel Board RGB WS2812 10pcs KCD1-11-2P Switch