12 Black Engine Spark Plug Wire Separator Divider Clamp Kit For 8Mm 9Mm 10Mm Perfect for 8mm, 9mm and 10mm wires. For 4 cylinder vehicles a 3pc set will work, but we recommend at minimum a 6pc kit (2 Sets) For 6/8 cylinder vehicles a 6pc set will work, but we recommend at minimum a 12pc kit (4 Sets)