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. » All Products » 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 10pcs SOP16/SSOP16/TSSOP16 SMD to DIP Adapter Digital Microscope 1000x USB to Serial Interface for ESP-01 WiFi Modules JGB37-520 DC Gearmotor (107 RPM at 12 V) JGB37-550 DC Gearmotor – High Power (1580 RPM at 12 V)