This vintage metal collapsible steamer is a must-have for anyone who loves to cook tamales and vegetables. The Progressus brand steamer is made of stainless steel.. It is a 1980s original piece, and includes one collapsible  steamer which is easily stored  The steamer is perfect for cooking vegetables and tamales, and is a great addition to any kitchen. It is also a collectible item. It fits most size pots, and can also be used inside an instant pot.