The flange free design of Expamet Unistarers means they can be used to construct any wall between 75mm and 250mm thick. One product, multiple applications. Manulfactured from stainless steel. Available in packs of 10. The flange free design of Expamet Unistarers means they can be used to construct any wall between 75mm and 250mm thick. One product, multiple applications. Manulfactured from stainless steel. Available in packs of 10.