What to check
Alloy, finish, wall thickness and hole tolerances are drawing-dependent.
Specification boundary
Material-family reference only: reference values, not a guaranteed specification. Ask for the selected grade data sheet and define acceptance tests before approval.
Material names identify options for review, not an approved grade or confirmed availability. Specify the backing channel and mounting holder separately. Aluminium requires separate supply review. Mentioning it in a drawing or specification does not confirm availability.