Don't want solid wooden doors on your cabinets? Mullions are thin slats that support smaller pieces of glass where a single large piece of glass would be subject to too much strain, such as within a cabinet door. Regardless of strain they also look more cozy and less commercial than a solid piece of glass. This time-honored style displays the contents of the cabinets and provides a lighter, more gleaming look than solid wood doors. Our Summit Craftman Dark Gray mullion door inserts are a perfect match for our Summit Craftman Dark Gray cabinetry series. This is a single mullion door insert fitted for our wall cabinets with item no. W3030. Glass is not included.