Seaview Adapter Plate f/Simrad HALO Open Array Radar Use f/Modular Mounts - ADA-R1 Required [ADA-HALO3]Adapter Plate for Simrad HALO Open Array Radar Use for Modular Mounts ADA R1 Required The Seaview Top Plates are made from a pre drilled plate that has been incased in a UV resistant ABS plastic. Drill templates come with all Seaview Top Plates. Simply drill the holes that are marked to your specific Simrad electronic. This makes for a very clean installation with no unecessary holes. Specifications: Construction: Aluminum Type: Adapters Box