The Grate Pad is an OEM replacement part for  Whirlpool gas ranges. This set of 4 pads is designed to fit securely underneath the grates above the burner pans. The grate pad works to protect the grates from scratches and prolong their service life. It also helps distribute heat evenly across cookware during cooking. Causes of a bad grate pad can include soiling or staining that is not removable through normal cleaning. Exposure to high heat over many years could cause cracks or brittleness in the material. Symptoms include: Scratches or pits appearing on the grate surface Warping of the pad shape makes secure fitting difficult The pad deteriorating or flaking off in pieces This part is also compatible with Maytag, KitchenAid, Jenn-Air, and other gas ranges8186321 (AP3851313) replaces 1176645, 9760219, AH988447, EA988447, PS988447.