ADD-ON KITS ONLY PROVIDE THE NECESSARY TOOLING TO CONVERT TO BIG-SERT M10x1.25 You must have the original kit P/N 6250. What is Included: Drill, Tap, Bushing, line pin, Inserts and dowels. Second repair after a failed coil style insert. Kit includes 10 inserts of the M10x1.25x24.5mm P/n 50125. Includes 2 Head alignment dowels of P/n 6255BS Toyota/Honda style and 2 smaller alignment dowels used in BMW P/n 7588BS.  Instructions are included in the kit. Tool setup video here.