Headlock Locking Header Bolts M8-1.25 x 25mm Set of 17 Fits 1991-up Ford 4.6L/5.4L and 2003-up Chrysler 5.7L/6.1L/6.4L Gen III Hemi Mr GasketHeadlock Bolts eliminate the need for lock washers, Period. That's because each Headlock Bolt features 24 equally spaced, stainless steel teeth serrations that bite into and hold onto the attaching surface eliminating the need for lock washers. 17 per Package Includes a ball head hex key socket installation tool that makes it easy to get them started 410 stainless steel Minimum 18 Inch,000 PSI tensile strength 24 equally spaced clockwise teeth