Shorefront Products › Corner Brace Medium Image 1 of 1 Corner Brace Medium $59.70 Utilize with 2x4 lumber. 5-1/2" high x 3-1/2" each side. 4 slots approximately 3/8"x 5/8". Quantity: Add To Cart Added! Utilize with 2x4 lumber. 5-1/2" high x 3-1/2" each side. 4 slots approximately 3/8"x 5/8".