Unistrut Trolley track hanger/joiner is made of hot-rolled pickled and oiled steel plates. It has an electrogalvanized finish to offer enhanced durability and corrosion resistance. It features steel pickling to produce smooth surface free from scale. Fittings are made from hot-rolled, pickled and oiled steel plates, bar, strip or coil, and conform to one or more of the following specifications: ASTM specifications A575, A576, A635, A1011 SS GR 33, A1011 HSLAS GR 45 or A36. All fittings meet or exceed physical properties of ASTM A1011 GR 33. The pickling of the steel produces a smooth surface free from scale.