4x Black Aluminium Gusset 90 Degree Corner Brackets   Universal Multi-purpose Mounting /  Bracketry Superior Solid Aluminium Corner Brackets, Extra Heavy Duty.  Will not CRACK and BREAK apart like other cheaper hollow Cast units. Adds strength and rigidity on connecting points. Material: Billet T6061 Aluminium Colour: Black Type: 4040 40 series 2 hole, Corner Gusset, Solid Heavy Duty  Dimensions: *see technical drawing Package quantity: 4x Black Aluminium 90 degree Corner Brackets Australian Seller Same day or Next business day postage.