This Built In Microwave Flush installation kit in Stainless with Black Trim should be used to allow for flush installation. The minimum cutout depth should be 18 3/16 inches. This kit also includes the necessary mounting hardware and installation instructions. Product Dimensions: 33.4645in x 11.811in x 2.3622 in. Installing this accessory will require basic hand tools, some disassembly of the microwave and novice repair experience. You must unplug the microwave or shut off the house circuit breaker for the appliance before installation.