EASY INSTALLATION: First remember to start with the positive terminal, remove the original battery terminal ends from the battery post and separate it from the battery cable. Press the separated battery cables onto our battery post. Place the pressed battery clips on the battery poles, tighten the bolts and secure the clips. SHOPPING LIST: A positive battery terminal connector and a negative battery terminal, each equipped with two 6mm diameter bolts at the head and one 8mm bolt at the tail. There are + and - symbols engraved on the surface of the product to distinguish the positive and negative poles during operation, which is very clear and concise. PREMIUM BRASS: Our battery post connectors are made of premium brass with outstanding electrical conductivity to minimize voltage distortion and power loss for long time use. The stable properties make it rust-free and long-lasting. The surface is smooth and exquisite, not easy to change color. WIDE VERSATILITY: This battery post terminals are very versatile and fit batteries with standard top posts (19mm / 0.75" positive and 17mm / 0.67" negative). With the right size, it can be used in cars, trucks, vans, RVs, car stereos, boats, and even large trucks, forklifts, and construction vehicles to name a few. FUNCTIONAL USE: The car battery terminal connectors are mainly used for connecting battery and battery cables, battery extension, parallel and grounding connections, can safely and stably transmit power, the battery stake head can withstand a maximum current of 300A. It is a powerful and stable automobile accessory!