Carlson Pro Pets Door Mount Royal Pet Door, Medium Our bi-parting door that is the best of the best with proprietary v-cam hinge system and commercial grade magnetic gasket for a proper seal every time Training tool provided to acclimate your pet to its new door Features security lock and quick attach stainless steel security panel Incredibly easy installation. Door closes quietly and automatically, versus a typical hard slam Medium Opening Dimension 16"l x 10"w