Usage 3-way corner brackets are used in the corners of a roof structure at the intersection of 2 roof beams (at a 90-degree angle to each other) and a vertical post (going down to the ground). 4x4 Corner Bracket Features Made with premium 14-gauge steel (~2.0mm thick) Made for dressed lumber commonly called 4x4s (actual dimensions are 3.5” x 3.5”) Laser-cut, bent and welded Advanced weather coating technology to withstand extreme weather conditions Pre-drilled holes for securing wood and accessories to bracket Includes stainless steel screws (1.5-inch #10 self-tapping wood screws with pan/round head painted black) for securing wood into bracket Backed by a 5-year warranty Shipped directly to your doorstep from Boise, Idaho Dimensions & Specifications Width: 7.5 inches (190.5 mm) Depth: 7.5 inches (190.5 mm) Height: 7.5 inches (190.5 mm) Number of arms: 3 (1 vertical + 2 horizontal) Inner dimensions of each arm: 3.6 x 3.6 inches (92 x 92 mm) - made for 4x4 wood posts (which measure 3.5 x 3.5 inches) Holes on vertical arm (to ground): 4 (2 holes on each of the 2 sides facing inward) Holes on each of the 2 horizontal arms (for beams): 6 (2 holes on the side facing down + 4 holes on the side facing inward) Hole size: 0.25 inch (6.35 mm) - ideal for #10 size screws (included) Weight: 4.125 pounds Not included: wood posts Other Universal Steel Brackets Check out our entire selection of universal 4x4 (and 2x4) steel brackets OR larger 6x6 (and 2x6) steel brackets.