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 JGB37-520 DC Gearmotor (45 RPM at 24 V) 10 pairs Alligator Clips (Red and Black) JA12-N20 DC Gearmotor (25 RPM at 3 V) Digital to Analog Audio Converter with Optical and Coaxial Input and RCA Output 10pcs 26-2.5A Plastic Gear