Alera Lighting Matte White Curv Series Direct/Indirect Fluorescent Fixture features heavy 20 gauge perforated steel housing, unique angling method on the center lamp to minimize length of the fixture without affecting the performance or operation of the unit and multi stage phosphate bonding process before being finished for consistent coverage and longevity. Thru-wiring 3 wire harness so that you can connect the harnesses to mount the fixtures in a row (BC1G).