3mm to 3mm Coupling Hub Please allow 4-6 days processing before ship out. For gearmotors or similar motors, we don’t ship using epacket and will use regular shipping if needed. Please note that regular shipping like singapore post might take 45-60 days to deliver, epacket 20 -35 days to deliver Thank you 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 Black 7040 Propeller with 6 mm Hole JGB37-520 DC Gearmotor (142 RPM at 6 V) 2pcs Hexagonal Motor Coupling Hub (4 mm) JGB37-550 DC Gearmotor – High Power (1580 RPM at 12 V) Remote E3D v6 3D Printer Head (0.4 mm nozzle, 3 mm filament)