This is the Radiation 4mm bullet connector with grip from Acuvance.

Battery Plug Grip set has an overwhelming cooling effect compared to conventional similar products, so it efficiently dissipates heat from the battery body from the grip part and reduces power loss during high-load driving.

A set of aluminum grip Radiation Grips and large-capacity power male connector (4mm).
Precise design according to the connector size and crimping fixation with set screws increase the adhesion between the grip and connector, and maximize the contact area with the aluminum volume and connector for efficient heat dissipation.
In addition, available in various colors like black/red, purple, red or black. With those options driver can create favorite style of power source much custom theme of RC car.

If the connector part deteriorates or wears out due to use, please use the separately sold Connector Kit (4mm/5mm/both with set screws).

You can also use the conventional power transmission connector (60629/60631). In this case, please use the set screw included in the Battery Plug Grip set.

Important
The aluminum cut-out parts of the radiation grip and the set screw are non-insulated (conductive). To prevent electric shock, never touch both the positive and negative grips at the same time while the battery is plugged in. Also, be careful not to short circuit due to metal fragments etc.

Please be careful when handling the battery and radiation grip as they may be hot immediately after driving.

Includes:
2x Radiation grip (1 each positive and negative)
2x 4mm bullet male connector
2x Set screw
1x Shrink tube (red) for identifying the positive side