2mm to 2mm 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 » Other » 2mm to 2mm Coupling Hub This copper coupler can be used for connection of 2mm to 2mm 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 2mm shafts of RC toys, boats and helicopters. Specifications Length: 20 mm Inner Diameter: 2 mm Material: Brass Related Products Black 8060 Propeller with 6 mm Hole JGB37-520 DC Gearmotor (35 RPM at 12 V) ELM OBD2 Extension Cable 60 cm Miniature Wireless Microphone Module JGB37-545 DC Gearmotor (66 RPM at 24 V)