1. Material: brass, iron screws
2. Product function: protect power supply, prevent leakage
3. Scope of application: general battery
4. Brass negative battery column, brass has good conductivity, corrosion resistance, and oxidation resistance
5. Nylon plastic shell is heat-resistant, wear-resistant and flame-retardant
6. Knob switch design, sturdy and durable
7. Copper head diameter: 15-17mm overall conical structure
8. Product weight: chuck type about 228g; screw type about 220g; copper head about 240g