HQRP 11-1/4 inch Glass Turntable Tray for Sharp 9KC3517203500 R309YK R309YV R309YW R318AV R331ZS Microwave Oven Cooking Plate + HQRP Coaster HQRP&reg; Replacement Microwave Plate plus HQRP&reg; Coaster; Overall diameter: 11 1/4 inches; Outside turntable track diameter where wheels fit: 8 3/4 inches; 1 Year warranty!