The RAM Cable Manager creates an integrated route for electrical wiring and cleanly covers installation holes. A great addition to any surface mounting application. The RAM Cable Manager is made of glass filled nylon which has the benefit of creating a barrier between the RAM Surface Mount and the attachment area; minimizing vibration while reducing fiberglass and gel-coat damage. This item will work with any of the 2 5/8" round plates with AMPs hole pattern.Features Made of glass filled nylon Minimizes vibration while reducing fiberglass and gel-coat damage Works with any RAM mounts 2 5/6" round plates with AMP pattern