Original Vintage O'Keefe & Merritt Gas Stove USED PORCELAIN ENAMELED 6 Spoke Burner Grate /  Open Style. The underside has 2 pegs. Used grates have wear. All of our used grates are very solid grates. 

Regarding Cleaning:

We clean the heavy grease (if any), but you still may want to still give it a more thorough cleaning. (Super-Clean in the purple container on Amazon works great.)

MEASUREMENTS: Ring Diameter 8-3/8"