The Aven Tools 21187-105 6-Piece Stainless Steel Combination Wrench Set is made from 304 series stainless steel. The set contains the following combination wrenches: 5/16 in., 3/8 in., 7/16 in., 1/2 in., 9/16 in. and 5/8 in., in handy roll up plastic pouch. The wrenches can be autoclaved up to 250 degrees Fahrenheit. The open ends are angled at 15 degrees, while the other ends are a 12 point box end that is offset at 15 degrees. The set's high quality construction helps eliminate the risk of ferrous contamination in the maintenance and operation of process equipment in clean rooms, food service and health care industries.