Sharp plastic roller ring 

Part number: FROLPA002URK0

Dimensions: Diameter approximately 210 mm, Wheel diameter approximately 18 mm

The microwave roller ring has many descriptions including microwave rollers, microwave turntable support ring and rotating ring. It is designed to carry the weight of the glass tray and allow it to rotate inside the microwave. Usually made of plastic with plastic wheels, the turntable roller ring sometimes by design is heat proof for use in combination ovens. The roller guide usually runs around a smooth section on the oven base.

Fits the Sharp R-33STM