Dekton Sum One Handed Adjustable Self Locking Wrench Spanner Pliers Tool Made of 40CR, Strong and durable. Three-sided tooth pattern coverage, not easy to slip, strong clamping, tight bite. Applicable to a variety of nuts and screw: hexagonal nuts, pipe nuts, octagonal nuts, round pipes scpeial-shaped screws. Large opening design, range: 7-43mm Spring self-locking automatic reset design. Multi-functional wrench, ring wrench + open-end wrench + adjustable wrench + socket wrench + pipe wrench + water pump wrench, all in one. The fast self-locking function can operate parts continously and effortlessly.