Features: Anti-Theft Battery Protection: The removable key feature provides a secure way to disconnect the power supply when the vehicle is not in use, prevents theft or accidental power activations. Material: Rust and corrosion resistant, Solid-Copper Terminals for the best performance and longest life Functional: Suitable for professional racing and car modification, installation is simple, safe and convenient. Application: Used for Car, Vehicle, RV and Boat, also electrical equipment's switch. Battery cut-off switch can be easily installed in a variety of locations, including the dashes or near the battery itself. Notice: 1.Actual color may be slightly different from the image due to different and light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Product specifications: four holes Diameter: 57mm Connection: M10 copper-bolt 1/2pcs Battery Isolators Kill Switch1/2pcs Battery Isolators Kill Switch