Oak Concave 12 for Pre-Installed Countertops Need expert countertop support advice? Call or text Tyler 970-690-0503 . Sold individually. For installation overview, please browse our product photos. We use the finest domestic hardwoods for our corbels. They are unfinished, but perfectly sanded. Our corbels are rated at 250lbs. when properly mounted and loaded uniformly. Designed/built/sold from our 3-person shop in Fort Collins, Colorado.