This ACDelco Cylinder Head Bolt & Stud Set is a reliable and durable option for vehicle owners looking to improve their engine's performance. The set includes 12 black steel bolts with a thread diameter of M12-1.75 and a length of 97mm, making it suitable for upper and front placement on most vehicles. The bolts are corrosion-resistant and easy to install, with a matte finish that adds to their sleek look. The items included in the set are made by ACDelco, a trusted brand in the automotive industry. They are OE/OEM part number 14077193 and are designed for a universal fitment in engines with a vintage part. The hex size of the bolts is also M12-1.75. Upgrade your vehicle's engine with this ACDelco Cylinder Head Bolt & Stud Set today!