The 3/16" x Steel x 21-1/4" long x 18" wide x 2-1/4" x 45 degree bend at fire box fits. drop-in Convection Plate fits all 20" T.O.P. smokers and requires NO-Tools to install . It is made from 3/16" thick plate steel and eliminates the "Hot Spot" and promotes even temps thought the cook chamber during the slow smoking process.***Please specify if you have a Single or a Double Lid Smoker in notes*** Convection plate for sale - for 20" smoker cooking chamber.