The rubber feet, also known as the burner grate foot, is used on the bottom of gas burner grates for a range and cooktop. The rubber feet help the grates sit on the top of a burner cap properly and works to keep it leveled. This way you can place your pans and pots on an even surface. This part also prevents your burner grates from scratching and damaging the top of your stove. This can lead to friction and the paint on the stove top can chip. Make sure to unplug range from power source before installing this part.