Manufactured from heat-treated Chrome Molybdenum steel. Features a rapid-acting helix design to aid in screw removal. Supplied in a convenient storage case. Includes five extractors with sizes: 1/8in.-1/4in., 1/4in.-5/16in., 5/16in.-7/16in., 7/16in.-9/16in., and 9/16in.-3/4in.. Sealey model AK722.