Rectangular grills (as pictured right) typically have more surface area, multiple burners and even an extra rack for warming or slow-cooking. Kettle (round) grills, meanwhile, can serve as a grill, stove or oven, and the grill surface can often be rotated. Regardless, always insist on marine-grade stainless steel to resist corrosion. A double-lined interior "safety" shell will keep the outside of the grill cooler, as well as make the grill more durable. Hinged lids should be balanced, so as not to slam shut if the anchorage gets waked, and they should be latchable for storage. The grease pan should be easily accessible for cleaning.