100% Brand New and High Quality 1.Ideal for maintaining the batteries charge over time. 2.Connects direct to the battery terminal and is cut off by loosening the green wheel. 3.Scope of application: various types of battery with a diameter of 15.5 - 17mm 1.Lightweight, compact design, safe and easy to operation. Fitment:Universal fits all 6v,12v and 24v Batteries:cars,vans,boat,motorcycle Color:Red / Black optional Material: Zinc Alloy+Brass Plated Base Diameter: 33mm Knob Bolt Pile Diameter: 15.5 - 17mm Package Included: 1Pcs x Cut off Switch Regarding the chromatic aberration and dimension error : As the light problem and the measuring method difference,maybe have a little error, please note and understand.Thank you.