Genuine OEM Hyundai Cylinder Head Steel Ball, part number 1601110000. This precision-engineered steel ball serves as a critical plug or seal within the engine's cylinder head, often used to block off internal oil or coolant passages after machining. Its spherical shape ensures a tight, leak-proof fit when pressed into place. Genuine OEM steel balls are manufactured to exact tolerances, which is essential for maintaining engine fluid integrity and preventing leaks under high pressure and temperature conditions.