Sharp Microwave Glass Turntable Plate / Tray for R309Y Models Measures approximately 11 1/4 inches in overall diameter. Outside diameter of turntable track is 8 3/4 inches. Only guaranteed to fit the following Sharp models... R309YW, R309YK, R309YV, R318AV, R331ZS PLEASE CHECK COMPATIBILITY BY LOCATING YOUR MODEL IN THE PRODUCT DESCRIPTION BELOW. Please contact us BEFORE ORDERING if unsure about compatibility