3mm to 3mm Coupling Hub Happy Chinese New Year!! WIDER WIRE & CABLE CO,.LIMITED will be temporarily suspend processing orders starting January 13 due to the holidays. We will resume our operations and process your orders placed on February. Thank you! » Other » 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 JA12-N30 DC Micro Gearmotor (280 RPM at 12 V) 0-30 V Red Panel Voltmeter Black Digital Thermometer with Hygrometer JGA25-370 DC Gearmotor (178 RPM at 24 V) 20pcs Universal CR20xx Battery Holder (CR2016, CR2025, CR2032)