This metal 90 degree bracket measures 2 x 2 x .188 x 0.875 inches with four .281 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 inch based extruded profiles. Works with many of our competitors 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 anodize finish ensures a perfect bracket. Made out of 6105-T5 or equivalent aluminum, this can be used as brackets for shelves, home improvement projects, t slot aluminum extrusion, or 3D Printer applications. #3393 assembly hardware is recommended (but not included) for 8020 1" based applications.