GP1088 SystemPod Pre-Cut for Garmin 820/820xs/840xs & 2 Instruments for 9.5" Wide Guard, GP1080 Series for 9.5" Guard, SystemPods for Sail are for mounting multiple pieces of electronics in one NavPod. This is a good way to reduce the height of a system. In addition to mounting a radar or chartplotter, you can have room for an autopilot, instrument, stereo controller, or VHF mic. A SystemPod is best mounted on a Single Bend AngleGuards. SystemPods for Power are for mounting on a SK135 Stachion Kit can be used to mount a SystemPod on a flat surface, such as the flybridge. Stachion Kits can also be used with a SystemPod for overhead mounting applications. Overall Size: 11.5"H x 19.75"W x 6.5"D, Usable Face: 9.5"H x 17"W x 5.5"D, Max Cutout: 9.375"H x 17"W, Instrument Cutout: 3.6". Acrylic capped ABS plastic, Chromed stainless steel tamper-proof fasteners, Double seal for watertight integrity, Models are available pre-cut for popular electronics, Stainless steel mounting hardware and mounting gaskets.