Boeray 20pcs 2 Hole Inside Corner Bracket Gusset for 2020 Series Aluminum Extrusion Profile with Slot 6mm Dimension: 20 x 17 x 20mm/0.79" x 0.67" x 0.79"(L*W*T), Use: M5 screw Pack qty: 20pcs Used for: connect aluminum profile 2020 series material: alloy finish: sand blasting