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Supco RK100 Electric Range Knob Kit This high-quality part is designed to meet or exceed OEM specifications. Universal Electric Range Knob Kit includes 4 knobs, 20 inserts, and surface overlays. About Supco Founded in 1945 in the Bronx, NY by two naval engineers, Sealed Unit Parts Co.,Inc (SUPCO) originated as a service company for refrigeration systems. We bring continued product line expansion through in-house development, master distributor relationships, and acquisition. This strengthens our position as a leader in the HVAC, Refrigeration and Appliance industries.