iSHOCK HDUSA Brass Knuckle Ball Joint SetsAll ball joints use a Japanese metric thread (like the bikes for which they were designed!). Sold in sets of 2.Always available, always correct, always warranted for life! Utilizes the very best seal components in the world from NOK Japan.Far Exceeds industry standards in quality, fitment, and tolerances. Includes drilled pin with castle nut and cotter pin for safety and ease of installation. Includes nuts, bolts, washers and all other necessary hardware. Sold in sets of two. Lifetime Warranty.