It will keep the plug wires in a tidy order and away from engine heat sources. Each Separator features secure grooves for each wire and a top bracket snaps in place to sandwich the wires in place. Each base has a hole for a retaining screw if desired and a tab that will help hold it in position. The kit is supplied with two 4-wire assemblies, two 3- wire assemblies and four 2-wire assemblies. No tools needed to open Wires stay in place when cover is removed Stand alone or can be bolted down.