Product name: M4mm Bullet Nut with thread, bullet 518B50
Inner diameter: 4MM
Outer diameter: 8MM
Product name: M4mm Bullet Nut with Reversed thread, bullet 518B50-R
Inner diameter: 4MM
Outer diameter: 8MM
Material: Aluminum
Suitable for use on 4MM shafts, M4 nuts. It is used to fasten the propeller and guide the flow.