Features: 1. The car battery clamps are made of high quality copper and thick ABS, which are rust-resistant, corrosion-resistant, stable and conductive. 2. The battery terminal product size: approx. 6.8 x 4.8 x 2.5 cm / 2.68 x 1.89 x 0.98''. Positive Diameter: Approx. 17.9mm / 0.7inch; Negative diameter: approx. 18.3mm / 0.72 inch, Maximum cable size: 60mm. 3. The color coding of positive and negative poles, red """"+"""" and blue """"-"""", Easy to see red and blue covers to avoid the risk of electric shock. 4. Car battery quick clamp is applied to 12V battery of car, RV, truck, con, boat, ATV and electrical equipment. 5. Your satisfaction is our main task. If you have any questions, please contact us at any time. We will offer you the most satisfactory solution. Specification: Material: Copper + ABS Colour: red and blue Positive Electrode Diameter: Approx. 19mm/0.75inch Negative Electrode Diameter: Approx. 17mm/0.67inch Maximum cable size: 60 mm Output power: 12 volts Maximum load: 500A Scope of delivery: 2 pairs of car battery clamps quick release