- Multifunctional self locking wrench with built-in automatic locking spring, designed with a self-locking function for convenient one-handed operation, simple and practical, greatly improving work efficiency. - Superior grip strength: forged double threaded jaws provide strong anti-slip performance, quickly adjust during use, and firmly grip pipes or nuts, making operation convenient and saving time and energy. - Durable and sturdy construction: forged from high-quality chromium vanadium alloy steel, featuring a large opening and multiple adjustable positions. The wrench is thickened, quenched and forged with hardness up to HRC 60, delivering twist resistance, stability, non-slip performance, durability, and long service life. - Self adjusting wrench with defined clamping ranges: 7-15 mm for 6 inches, 9-25 mm for 8 inches, 15-35 mm for 10 inches, and 19-43 mm for 12 inches, enabling wide use on pipe, screw, nut and other fasteners. - Use scenarios: - Plumbing tasks in tight spaces where one-handed operation helps quickly tighten or loosen pipe fittings. - Mechanical or automotive maintenance requiring secure grip on nuts or pipes in restricted areas. - Home improvement and DIY projects involving pipe, screw, or nut adjustments in confined spaces.