Compatible and applicable: The quick battery terminal connector is mainly used for SAE / JIS A type car battery, the connection is firm and not easy to damage. Safety protection: The Quick release device has a red positive "+" and a black negative "-", which are easy to identify to avoid the risk of electric shock. Material: Tin-plated pure copper battery terminal has good electrical conductivity and reduces transmission power loss. It has strong corrosion resistance and can be used for a long time. Widely compatible: suitable for battery terminal connectors for cars, trucks, buses, battery cars, new energy batteries , etc. Quantity: 1 pair of battery connector (1 positive, 1 negative); + pole inner diameter: 17.5mm, pole inner diameter: 16mm. Product Description Features: The red and black covers easy to identify reduce the risk of electric shock Cable end is suitable for 6/12V battery board Pure copper tin plate and plastic can insulate the connection Corrosion resistance, good electrical conductivity Convenient wiring and firm connection Features: Product name: connector of fast battery terminal Product material: tinned pure copper + plastic shell Screw diameter: 6mm Product weight: 221g / 1 pair Product inner diameter: 16-18mm Positive inner diameter: 17.5mm / 0.69inch Inner diameter of the negative electrode: 16mm / 0.63inch Product size: 55mm 43mm 39mm Application: suitable for SAE type auto batteries / JIS A Product packaging: 1 red battery terminal connector 1 black battery terminal connector