Battery Bolt with Shoulder Nut made from zinc-plated steel to protect against corrosion and ensure a long service life. Battery bolts are important for securing your battery in the vehicle and making sure it remains in place. It is essential to have the correct battery bolt size in this process. This product is a 5/16\"-18 by 1-1/4\" bolt and includes a 5/16\"-18 hex nut.