This flat metal bracket measures 3 x .188 x 3 inches long with five 0.257 inch diameter thru holes on 1 inch centerlines. Perfect for your 80/20 t slot aluminum extrusion project! 8020 corner bracket is compatible with 10 Series aluminum extrusions or 1" based extruded profiles. Works with many of our competitor's aluminum extruded frame. Strong durable brackets that can be easily removable and reused. Top line quality control with smooth de-burred edges, tight tolerances, and a clear anodize finish ensures a perfect bracket. Made out of 6063-T6 aluminum, this can be used as braces, home improvement projects, t slot aluminum extrusion, or 3D Printer applications. #3321 assembly hardware is recommended (but not included) for 8020 based 1" extruded applications. The 5 hole - "T" flat plate is a strong, external fastening method offering a long-lasting connection. This flat plate creates a 90-degree angle between connecting profiles. The fastener is flush with the profiles, allowing for a larger clearance area. It requires no machining services, is easy to assemble, and can be reconfigured and reused.