4x 40 series 4040 4080 T Slot Aluminium Profile 90 Degree Corner Brackets Black  Superior Solid Aluminium Corner Brackets, Extra Heavy Duty.  Will not CRACK and BREAK apart like the cheaper hollow Cast units. Adds strength and rigidity to aluminium extrusion T slot profile connecting points. Material: Billet T6061 Aluminium Colour: Black Type: 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.