Unlike other metal objects, the metal rack included with your microwave is specially designed for safe use. The design takes into account the pattern of microwaves to prevent arching and sparks.

For example: The plastic spacers which hold the rack in place are engineered to keep it from arching against the microwave’s sides. The rack’s tines and outer edges are engineered to form a fully enclosed object, avoiding the open ends that lead to arching.

No other metal objects, including pans, utensils, etc. are approved for use inside a microwave.