Question: What is the flange thickness (mm) for the weight (kg/m) 10.4?
Schema: create table table_2071644_1 (flange_thickness__mm_ varchar, weight__kg_m_ varchar, PRIMARY KEY (flange_thickness__mm_))
SQL: select flange_thickness__mm_ from table_2071644_1 where weight__kg_m_ = "10.4"