Features: 1.Cast from alloy at scientific ratio, provides longer lifetime and more functionality than the ordinary alloy products. 2. Excellent plasticity and good electrical conductivity, which can reduce voltage distortion and current transmission loss. 3. Strong corrosion resistance, easy wiring. 4.Convenient to install on negative battery head. 5.Suitable for various types of batteries with a pile head diameter of 15-17mm. Specification: Features: 1. Cast from alloy at scientific ratio, provides longer lifetime and more functionality than the ordinary alloy products. 2. Excellent plasticity and good electrical conductivity, which can reduce voltage distortion and current transmission loss. 3. Strong corrosion resistance, easy wiring. 4. Convenient to install on negative battery head. 5. Suitable for various types of batteries with a pile head diameter of 15-17mm. Specification: Condition: 100% Brand New Material: Zinc Alloy Color: Black, Green(optional) Weight: about 122g/4.3oz Size: about 8.5*3.5*2.5cm/3.35*1.38*0.98in Package List: 1 * Cut-off Switch Instructions: Loosing the switch means power off, and tightening the switch allows to conduct electricity. Installation Method: 1. Check whether the negative battery post and the battery clamp (original battery connector) are corroded (white powder) or dirty after installation (to prevent contact between the battery and the battery switch). 2. Before installing the battery switch, first tighten the green knob and then install it on the car. After the completion, check if there is looseness, make sure it is installed. PackageList: