Ajusa's Cylinder Head Bolt Sets are manufactured to OE or higher standards, using only premium materials and the latest machining processes. Head bolt sets are provided in a shrink-wrapped cardboard window box. The shrink wrap assures you that you have received a complete bolt kit - the window box allows you to verify contents match what you intend to replace. OE style Torque-To-Yield (TTY) head bolts are engineered to stretch slightly when torqued to ensure proper clamping force and a leak proof seal. All Ajusa head bolt sets are manufactured to ISO9001 and TS16949 standards. Assembly lube for bolt heads and threads is included. Use of lube ensures consistent torque readings across all bolts. Established in 1972, Ajusa is one of the world's leading manufacturers of gaskets/sets, cylinder head bolt sets, and hydraulic lifters. Ajusa offers the widest coverage for European and Asian applications, especially late model vehicles.