3mm 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. » Other » 3mm to 5mm Coupling Hub This copper coupler can be used for connection of 3mm 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 3mm to 5mm shafts of RC toys, boats and helicopters. Specifications Length: 20 mm Material: Brass Related Products 50pcs XH2.54-16P Connector Black 1047 Propeller with 6 mm Hole Red Push Button Module ADS1015 ADC Module ULN2003 Darlington Array Module