Featuring precision-tooled or machined tooth form and precision-machined bore for true fit, timing chain sprockets offer reliability and dependability for engine rebuilds and typical replacement jobs; Recommended that the chain tensioner(s), sprocket(s), and guide(s) also be replaced when the chain is replaced, as these components play a vital role in system stability and accurate timing; CAD designed and manufactured using premium materials; Each part is extensively tested and measured for function, fitment, and durability to ensure optimal performance; Includes new camshaft phaser torque-to-yield (TTY) attachment bolts (if necessary) to ensure proper installation and phaser function