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:_x000D_ 1. Cast from alloy at scientific ratio, provides longer lifetime and more functionality than the ordinary alloy products._x000D_ 2. Excellent plasticity and good electrical conductivity, which can reduce voltage distortion and current transmission loss._x000D_ 3. Strong corrosion resistance, easy wiring._x000D_ 4. Convenient to install on negative battery head._x000D_ 5. Suitable for various types of batteries with a pile head diameter of 15-17mm._x000D_ _x000D_ Specification:_x000D_ Condition: 100% Brand New_x000D_ Material: Zinc Alloy_x000D_ Color: Black, Green(optional)_x000D_ Weight: about 122g/4.3oz_x000D_ Size: about 8.5*3.5*2.5cm/3.35*1.38*0.98in_x000D_ _x000D_ Package List:_x000D_ 1 * Cut-off Switch_x000D_ _x000D_ Instructions:_x000D_ Loosing the switch means power off, and tightening the switch allows to conduct electricity._x000D_ _x000D_ Installation Method:_x000D_ 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)._x000D_ 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: