Tight connection: as the key component connecting the engine cylinder head and cylinder block, the cylinder head bolt bears a huge fastening force. It can firmly fix the cylinder head on the cylinder block to a tight fit between the two, prevent gaps from appearing when the engine is working, avoid high-temperature and high-pressure gas leakage, maintain the normal pressure environment inside the engine, and the efficient operation of the engine. Superb craftsmanship: Through advanced forging process, the internal organization of the bolt is more dense and uniform, which improves the strength and toughness of the material. Precise thread machining ensures a with the nut or screw hole, reducing the risk of thread wear and loosening. heat treatment process further optimizes the mechanical properties of the bolt and enhances its fatigue resistance. Not easy to damage, long service life Made of high quality material, for use. name:Engine cylinder head bolt kit Part Number: ES72434 HBK928 90910-A2011 Fitment: Fit for 2009-2010 Fit for CT200h 2011-2017 Fit for 2009-2020 Fit for Matrix 2009-2014 Fit for iM 2017-2018 Fit for Prius 2010-2020 Fit for Prius V 2012-2018 Fit for Prius Plug-In 2012-2015 Fit for Prius P 2017-2020 (For Engine: 2ZRFE, 2ZRFXE, 1.8L L4 DOHC) Colour:Black Material:Metal Package Contents: 10 pcs x Engine cylinder head bolt Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.