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Q:I own a Bosch gas cooktop range.
A:For help with Bosch appliances you will need to contact them directly.
Q:What size is this knob?
A:This Vulcan Hart Red Burner Knob measures 2-1/2 inches in diameter and 3/4-inch thick. The D stem flat is up/down.
Q:Are they metal or plastic?
A:This OEM Vulcan Burner Knob is made of plastic material.
Q:Will these knobs fit my Whirlpool oven, if not, can it be returned?
A:This is a Vulcan OEM part, and we do not source or distribute any Whirlpool units, so we are unable to effectively answer this for you.