ISRI 200 (HMS 1): Wrought iron or steel scrap 1 4 inch (6.35 mm) and larger in thickness. All pieces must be smaller than 60 in 24 in (1,524 mm 610 mm) ISRI 201 (HMS 1): Same as ISRI 200 except pieces must be smaller than 36 in 18 in (914 mm 457 mm).
