Create a fixed internal mounting location for custom-built equipment panels inside compatible SKB Cases 3I-2217 protective cases. The 3I-2217-PRK panel ring kit supports installations where connectors, switches, displays, instrumentation, or other hardware must be mounted to a panel held within the case rather than placed loose in the enclosure. The kit is intended for 3I-2217 case configurations in 8, 10, and 12 depths. That shared fitment lets an integrator retain the same case footprint while selecting the enclosure depth needed for the installed equipment. It is suited to portable test assemblies, field communications equipment, protected control stations, and custom electronics cases that require a repeatable panel-mounting point. Use the panel ring kit when the enclosure must protect the equipment while still providing an organized internal structure for a custom panel. It is an accessory for the case enclosure, not a replacement case. Confirm that the installed case belongs to the 3I-2217 family and uses one of the supported depth configurations before selecting the kit.