Supco RK100 Electric Range Knob Kit Includes 4 Knobs, 20 Inserts and Surface Overlays RANGE KNOB KIT - Universal Electric Range Knob Kit includes 4 knobs, 20 inserts, and surface overlays. PREMIUM REPLACEMENT - Supco RK100 electric range knob kit is designed to meet or exceed OEM specifications HIGHEST-QUALITY PARTS - Supco parts are built to last and a popular choice among repair technicians and DIYers.