Features: 4 Pin 12V AMP 500A Relay Car Starter On/Off Power Switch Dual Battery Isolator Specification: Quantity: 1pc Size app: 7,Bottom Hole Max Length 6,Bolt Dia 0 Material: Metal/Plastic Color:Black Conversion: 1cm=0/1 inch=2 Notice: 1 Due to the sunshine and screen difference, the item's shade could also be slightly varied from the images 2 Please enable 0 cm variations because of manual dimension