4mm to 5mm 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. » Connectors » 4mm to 5mm Coupling Hub This copper coupler can be used for connection of 4mm to 5mm 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 4mm to 5mm shafts of RC toys, boats and helicopters. Specifications Length: 20 mm Material: Brass Related Products Proximity E3D v5 3D Printer Head (0.5 mm nozzle, 1.75 mm filament) 20pcs Colored 40p 2.54 mm Pitch Male Pin Header – Red JA12-N30 DC Micro Gearmotor (470 RPM at 12 V) JA12-N30 DC Micro Gearmotor (140 RPM at 6 V) JA12-N20 DC Gearmotor (300 RPM at 6 V)