Sharp Microwave / Convection Ceramic Tray for R1870 Series This microwave plate ONLY fits the Sharp models listed below. If you are unsure about compatibility please email us with your model number BEFORE ORDERING. Ceramic turntable plate / tray for Sharp over the range microwave / convection ovens. Measures approximately 12 7/8 inches in overall diameter. Outside diameter of turntable track on bottom of tray is approximately 9 inches. This ceramic tray replaces Sharp part # : NTNT-A114WREZ