This metal 90 degree bracket measures 1.5 x 1.5 x .25 x 1.31 inches with two .328 inch diameter thru holes. Perfect for your 80/20 t slot aluminum extrusion project! 8020 corner bracket is compatible with 15 Series aluminum extrusions or 1.5 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. #3330 and #3278 assembly hardware is recommended (but not included) for 8020 1.5" based applications.