Plate Flat Bar is sheared and processed from stainless plate. The edges are then "treated" (milled). Though it is flattened and straightened as part of the process, sheared and edged bar is not as dimensional “true” as true flat bar.
304 stainless steel is a type of austenitic stainless steel that contains 18% chromium and 8% nickel. It is the most common grade of stainless steel and is widely used in a variety of applications due to its excellent corrosion resistance, high temperature resistance, and good formability and weldability. Chrome-Nickel, Austenitic (Non-Magnetic).

Material: Stainless Steel
Shape: Flat Bar
Alloy: 304
Temper: Annealed
Thickness: 0.250 inch
Width: 1.500 inches
Finish: HRAP
Specifications: ASTM A240, A480
Tolerances: Thickness and Width: Industry Standards | Length: Listed length at minimum, plus up to 1 inch.