【Available Quantity】: There are 1 pack and 2 pack that you can choose from, which is very convenient and thoughtful. You can choose to purchase according to your quantity requirements. Buying in sufficient quantities, whether it's for backup or sharing with family and friends, is a good choice. 【Convenient】: Used for batteries, isolating and securing electrical systems, removing any power consumption from batteries when not in use on vehicles or ships, and securely disconnecting batteries. Knob installation. It is easy to use, just loosen/unscrew the knob, the power will be disconnected. 【High Quality】: The main body of the battery head switch is zinc alloy copper plated, good conductivity and stable current. Plastic knob, insulating material, which is very safe. This battery head switch is rugged and equipped with iron screws and nuts for rust and corrosion protection. 【Standard Specification】: This side mounted battery disconnect switch is used for General Motors side pillar batteries or other batteries with 3/8 inch side pillar terminals. It is suitable for automotive, truck, ship, ATV, or RV batteries, as well as batteries for other electrical equipment. 【Safety Protection】: Brass switch battery heads prevent self-discharge and leakage, protecting the battery. The side-post battery disconnect switch is also very safe to use, with no fear of electric shock damage. It is ideal for general purpose vehicle tool accessories.