Original Vintage Late 50's / early 60's O'Keefe & Merritt DeVille Stove Top Griddle Burner w/ New Chromed Star Burner Cover. 

MEASUREMENTS 

Overall Length 7-7/8" / Vent Diameter: 2-1/4"  /  Burner Diameter (measured from underside) 3-1/2" /  Star Cover Top Diameter 2-1/4"