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 10pcs 1 x 40 Breakable Female Pin Header JGB37-545 DC Gearmotor (12 RPM at 24 V) 100W LED with Color Temperature of 3000-3500 K JGA20-130 DC Micro Gearmotor (120 RPM at 12 V) NE555 Pulse Generator Module