FEATURES: Mold Injected: Stronger and More Durable. 5.25″ factory to 6.5″ Aftermarket Speaker Adapter Nice Clean, flawless finish all the way around. Support guides in mold for easy installation: Our adapters have built in “Screw Guides” so when installing the product there’s not much room for mistake. The guides help you to line up the holes more accurately. Speaker adapter rings are compatible with stock or aftermarket replacement grills.