The benefit of our countertop support bracket is as following: SUPPORT - and strengthen your granite countertops helping you avoid potentially costly and dangerous breaks. HIDDEN - The countertop support bracket provide a more spacious and open looking looking environment. TOUGH - Most of our granite brackets are made of 1/2 inch steel and have multiple mounting points. SAFE - Our brackets mount directly to your knee / pony wall providing a strong and stable structure for your granite countertop to rest on. THIN - no corbels or braces for you or your guests to hit their knees on. INEXPENSIVE - typically our heavy duty shelf brackets are much less expensive than corbels. What length granite bracket will you need? Typically the heavy duty L bracket will be the same length as the overhang. ?If the overhang is 12 inch, the length of the bracket should include the width of the knee wall. In most instances the knee wall is 4 inches wide. The overhang plus the knee wall = 16 inches. ?Granite Brackets should be set three - four inches back from the edge of the granite counter top to insure they are hidden from view. So - 16 inches - 4 inches = 12 inch brackets. ?If your knee wall is made from 2 x 6s then be sure to adjust your size to accommodate the extra 2 inches.