The Zurn PN400-5S-GRID Grating Floor Drain is a square-shaped drain designed for commercial flooring applications.It features a 4-5/8" size,indicating the dimensions of the grating surface.The "GRID" designation signifies the grating pattern, which provides efficient drainage while preventing large debris from entering the drain. Constructed from durable materials, it's designed to wi... https://partsfe.com/pn400-5s-grid-zurn-drain-gratefloor-sq4-58