What is an appliance trim kit?

A stainless steel or custom-finished frame that borders a built-in appliance opening, bridging the gap between a standard appliance size and the custom cabinet surround. Used on microwaves, speed ovens, warming drawers, and drawer dishwashers, a trim kit creates a flush, furniture-grade transition without requiring a fully integrated (panel-ready) unit. The surrounding cabinet carcass is built to the trim kit's specified outer dimensions rather than the appliance dimensions.