What is the flange width (mm) for cross section area (cm 2) 16.4?
create table table_2071644_1 (flange_width__mm_ varchar, cross_section_area__cm_2__ varchar, PRIMARY KEY (flange_width__mm_))
select count(flange_width__mm_) from table_2071644_1 where cross_section_area__cm_2__ = "16.4"