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 ESP8266 ESP-12F Wit Cloud Development Board SI4463 Wireless Bluetooth Module 500x USB Digital Microscope M2x10 mm Screw + Nut (30pcs pack) DS3231 AT24C32 High Precision Clock Module with I2C Interface