BMW head bolt thread repair 3 & 5 Series p/n 1090 Time-Sert Head bolt repair kit for 3&5 series Aluminum blocks BMW M10x1.5 All the tools and 14 insert are included. This kit installs a M10x1.5 x24mm insert into a 6mm countersink. This kit makes it easy to repair head bolts in BMWs This is a "first time repair kit" where no helicoils were used.