1.SELF LOCKING FUNCTION: Self Adjusting Pipe Wrench, its built-in automatic locking spring, three-sided tooth design, firmly grips most types of fasteners, including hex head, spline head, star head and square head nuts, bolts and screws, even damaged fasteners 2.SUPER GRIP STRENGTH: The forged double-threaded jaws of the Self Locking Universal Adjustable Pipe Wrench have good anti-slip properties, and the special pliers allow the heavy duty pipe wrench set to rotate backwards and reposition, making it anti-slip and quick to adjust. This wrench is designed to provide maximum grip and torque, suitable for automotive, plumbing, carpentry, mechanical and plumbing repair work 3.HIGH-QUALITY MATERIALS: The Pipe Wrench Set is forged from high-quality chrome-vanadium alloy steel with a large opening. It is thickened, quenched and forged with a hardness of up to hrc60. Safe, stable, non-slip, sturdy, durable and long life 4.MFORTABLE HANDLE: The Self Adjusting Pipe Wrench handle is ergonomically designed to keep the user's wrist in a comfortable position and to reduce pressure for all plumbing-related home repairs, such as water tank repairs, household plumbing repairs, vehicle repairs, etc