Bear Metal has refined a design by a local restaurant owner of these steamer bins. This product is completely made of 304 stainless steel and is NSF certified for a kitchen. The design, which has a bottom pan you fill with water and set on top of your stove top/grill to get the water boiling. The top two trays are then set in the water as you fill your trays with veggies/seafood etc and get them steaming! These can be used in your own home on your stove as well because of their light weight and size. Fabricated right here in Buffalo NY, contact us to order yours today!