KitchenAid Whirlpool Refrigerator Glass Shelf Tempered Glass 20" wide. From a 42 inch KitchenAid

model KSSS42FMX or similar model, built-in refrigerator the shelf is 20 and 1/8 wide. Tempered glass Spill Clean surface.   Has hook on back for hanging.  (see photos) In excellent condition.