The Screw Tceir M6x25 is the lowest priced item on this 008 Timing System schematic.
The 008 Timing System is made up of components including this Timing Gears Set which is the most expensive.
Some items from this specific schematic: Vertical Belt Outer Cover Black, Pulley, Timing Belt, Outer Central Cover Black, Nut M14x1.00x7.