WORC Brushless Motor ESC 6.5mm Male to 4mm Female Bullet Connector Adapters (3)

Connector Type: 6.5mm Banana Plug to 4.0mm Banana Plug(Male to Female) 

6.5mm Male to 4mm Female 

Solderless / Wireless

3 Pack 

Most 1/8 or 4s+ ESC's to 1/10 BL motors use 4mm

Great for upgrading high power ESC's