Feature 1PLUM 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. 2STRONG 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. 3PROFESSIONAL: Nut extractor socket is professional and functional product, you can remove damaged, broken, rusty, rounded off bolts, nuts and screws. 4SURFACE COATING PROCESS: Bolt remover tool set is coated with a surface coating process, oxidized to black, more wear resistant and less prone to rust. 5APPLICABLE SIZE: Bolt nut extractor set is made of chromium molybdenum steel and fits nuts of 17mm, 19mm, 21mm, 22mm diameter.Item Type: Bolt Nut Remover SetMaterial: Chromium Molybdenum Steel, Overall Heat TreatmentSpecification: Socket 17mm/0.67in, 19mm/0.75in, 21mm/0.83in, 22mm/0.87in, Socket Length 48mm/1.89inGross Weight: 811g/1.8lb .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List4 x Nut Remover1 x Stainless Steel Rod1 x Storage BoxNoteAll data are measured manually, and there are certain errors in the measurement results.