Upgrade your vehicle's suspension system with this pair of premium center bolts designed specifically for leaf springs. Each bolt measures 5/16 inch in diameter and 4 inches in length, featuring precise fine threading for secure installation. The 1/2-inch bolt heads provide reliable grip for proper torque application. These heavy-duty center bolts are essential for maintaining proper leaf spring alignment and preventing spring shift during vehicle operation. Perfect for automotive repair and restoration projects, these bolts come complete with matching nuts for a complete installation solution. The robust construction ensures lasting performance under demanding conditions, while the fine thread pattern offers superior clamping force compared to standard thread options. Ideal for trucks, trailers, and other vehicles equipped with leaf spring suspension systems.