Battery-to-controller and controller-to-motor connectors.
Available in 5mm, 5.5mm and 6.5mm.
Size is based on the inner diameter of female connector, which is typically 0.1mm less due to measurement.
Product images show the 5mm version. The last product image shows a 5.5mm female motor connector on Kaabo Wolf Warrior King GT Pro Controller (50 amp sinewave) which is identical to that adopted on NAMI Burn-e Bullet motors.
Current rating: 5.0mm: 80A; 5.5mm: 100A
Wrap with heat shrink or high temperature insulating Polyamide tape (clear brown colour).