2mm 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 » Connectors » 2mm to 3mm Coupling Hub This copper coupler can be used for connection of 2mm 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 2mm to 3mm shafts of RC toys, boats and helicopters. Specifications Length: 20 mm Material: Brass Related Products 10pcs 20-2.5A Plastic Gear 10pcs Silver Slotted Aluminum Heat Sink (13x13x11mm) Proximity E3D v6 3D Printer Head (0.2 mm nozzle, 3 mm filament) JA12-N20 DC Gearmotor (200 RPM at 12 V) JGA25-370 DC Gearmotor (10 RPM at 24 V)