Item Type: Bolt Nut Remover Set_x000D_ Material: Chromium Molybdenum Steel, Overall Heat Treatment_x000D_ Specification: Socket 17mm/0.67in, 19mm/0.75in, 21mm/0.83in, 22mm/0.87in, Socket Length 48mm/1.89in_x000D_ Gross Weight: 811g/1.8lb 1、PLUM SHAPED FEMALE THREAD: Bolt nut remover set features a unique plum shaped female thread design that provides excellent torsion for rotating fasteners with deep bolts. 2、STRONG GRIP: The uneven internal walls help support the hard nut, and the more you rotate it, the tighter the grip will be and the easier it will be to not break or slide. 3、PROFESSIONAL: Nut extractor socket is professional and functional product, you can remove damaged, broken, rusty, rounded off bolts, nuts and screws. 4、SURFACE COATING PROCESS: Bolt remover tool set is coated with a surface coating process, oxidized to black, more wear resistant and less prone to rust. 5、APPLICABLE SIZE: Bolt nut extractor set is made of chromium molybdenum steel and fits nuts of 17mm, 19mm, 21mm, 22mm diameter. 4 x Nut Remover 1 x Stainless Steel Rod 1 x Storage Box All data are measured manually, and there are certain errors in the measurement results.