Boeray 6pcs 3060 Inside Corner Bracket Gusset for 3030 or 3060 Series Aluminum Extrusion Profile with Slot 8mm Material: AL Alloy Dimension: 58x58x28mm Metric,use M8 or M6 screw. Used for: Aluminum Extrusion with Profile 3030 or 3060 Pack quantity: 6pcs Pack Weight: 250g