The Ford Performance Parts Flywheel Bolts M-6379-B are high-quality, direct replacement fasteners designed specifically for Ford 4.6L engines with a 1-piece rear main seal. Each bolt features a hex head and is made from durable steel with a black oxide finish for corrosion resistance and added strength. These bolts have an M10 x 1.0 thread size and an underhead length of 26.6mm, ensuring a precise fit and proper torque engagement with manual transmission flywheels. Washers are not included. Sold as a set of eight, these bolts are engineered to meet Ford OE specifications, providing reliable clamping force for secure flywheel installation. Ideal for performance builds or factory replacements, they help ensure a safe, worry-free connection between the flywheel and crankshaft.