VMS Racing .50 Caliber Bullet Wire Separators. These wire separators are made of high quality ABS plastic and are triple chrome plated for a Long lasting finish. These will only work with spark plug wires from 8MM to 9MM thickness, will not fit 10MM and larger wires. Very easy to install, does not requires removal of spark plug wires. Universal fitment, will fit all 8MM and 9MM wires. These are sold in packs of 4.