DIMENSIONS - These twist socket nut extractors includes 17MM, 19MM, 21MM, and 22MM bolt and a drift punch nut removal bar. | APPLICATION - Remove worn lock nuts to quickly remove them, including rust, deformation, peeling or breaking, and car wheel hubs. | MATERIAL - Durable high hardness chromium molybdenum steel. | FEATURES - Plum-shaped internal thread design provides excellent torque for easy fastening. The unique texture inside makes it easier to hold on to the stubborn nut for easy removal. | Use with 1/2" drive tools.