General description Sealey AK722 Helix Type Screw Extractor Set includes five pieces designed for efficient screw removal. Manufactured from heat-treated Chrome Molybdenum steel, this set is built for durability and longevity. It comes supplied in a convenient storage case. Technical specifications Material: Heat treated Chrome Molybdenum steel Sizes: 1/8"-1/4", 1/4"-5/16", 5/16"-7/16", 7/16"-9/16", 9/16"-3/4" Model No.: AK722 EAN: 5024209250078 Other information