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 Digital Watt Meter max DC 60V 100A JA12-N20 DC Gearmotor (600 RPM at 12 V) 10pcs FPC 12p PCB Adapter M2x6 mm Screw + Nut (30 pcs pack) JGB37-550 DC Gearmotor – High Power (175 RPM at 12 V)