Stainless steel with double sided wire rack allows this canner to be used either as a steam or water bath canner. Indicator on lid tells exactly when to start processing. Water Bath Canning Jar Capacity: 8 pints 7 quarts. Steam Canning Jar Capacity: 9 pints 8 quarts or 5 half gallons. Diameter of pan bottom is 12.5 inches Top of pan diameter is 13.25 inches. Does NOT have a flat bottom. Please Note: Not for use on smooth top flat top or ceramic top ranges.