Manufacturer Description The RAM Cable Manager creates an integrated route for electrical wiring and cleanly covers installation holes, and is 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. Compatible RAM Mounts: Compatible with all 2.25" "D" ball bases that contain a three hole, 120 degree hole pattern. Material: High Strength Composite and Glass Filled Nylon NOTE: RAM ball base not included with purchase.