Use to add aftermarket speakers to factory door location. Speeds up installation time. Includes two pair for four doors- 4 plates. Aftermarket speakers vary in size, width, depth, etc so even though it might be listed as a 6.5" etc speaker, some speakers might require modification of the speaker adapter which is normal. Plate dimensions- Approximately 1 and 1/8th" inch depth, 5 and 3/4th" inch mounting width. Compatible Vehicles: Made for most 2006-2022 Kia and Hyundai Vehicles - double check your vehicle's factory speaker to be sure.