A robust screw extractor set for removing screws, bolts, pipes and studs. Sizes: M3 – M6 (1/8″ – 1/4″), M6 – M8 (1/4″ – 5/16″), M8 – M11 (5/16″ – 7/16″), M11 – M14 (7/16″ – 9/16″), M14 – M18 (9/16″ – 3/4″), M18 – M25 (3/4″ – 1″). Metric/imperial equivalent sizes. Manufactured from chrome molybdenum.