23.75" x 19.75"ID. No cracks that I could see or hear. Almost 3/4 thick at inside.I try to provide you with the most accurate description possible but may, because of my limited knowledge of particular items, leave something of importance out that a collector may want to know. I do offer a 100% satisfaction guarantee. Thanks in advance and good luck. The item "Vintage Cast Iron Floor Grate with Greek Key Border" is in sale since Tuesday, April 12, 2016. This item is in the category "Antiques\Architectural & Garden\Hardware\Heating Grates & Vents". The seller is "cjhouk73hj" and is located in Wooster, Ohio. This item can be shipped to United States, to Canada, to United Kingdom, DK, RO, SK, BG, CZ, FI, HU, LV, LT, MT, EE, to Australia, GR, PT, CY, SI, to Japan, SE, KR, ID, to Taiwan, ZA, to Belgium, to France, to Hong Kong, to Ireland, to Netherlands, PL, to Spain, to Italy, to Germany, to Austria, IL, to Mexico, to New Zealand, PH, SG, NO, SA, UA, AE, QA, KW, BH, HR, MY, TR, CL, CO, CR, DO, PA, TT, GT, SV, HN, JM.