It is made of 304 stainless steel with a brushed #4 finish.
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Stainless Steel Flat Bar Stock 1/8″ x 3/4″ x 6 Feet Rectangular 304 Mill Finish
Finish: Mill. Alloy Type: 304. Shape: Rectangular Bar. Item: Stainless Steel Flat Bar. Material: Stainless Steel. Material Grade: 304. Hardness Scale: BHN. Heat Treatable: Yes.