1.1 This specification covers aluminum-alloy rolled flat tread plate, mill-finish, with a raised pattern on one side, in the alloy, tempers, and thicknesses shown in Table 1 and Table 2 [Table 3]. 1.2 Alloy and temper de This specification covers aluminum-alloy rolled tread plate. Unless otherwise specified, all tread plate shall be supplied in the mill finish and shall be uniform as defined by the requirements and shall be commercially sound. The tread plate shall con