1.Premium Craftsmanship: Crafted from heavy duty 45# carbon steel, this self adjusting wrench undergo precise processing, hardening, quenching, and forging. With a remarkable hardness of HRC 48-52, they boast excellent toughness, a rust-proof surface, and effortless rotation. 2.Versatile Adjustability: The two-piece set includes a 10' wrench with a jaw capacity of 0.55' - 1.18' and a 14' wrench with a jaw capacity of 1.18' - 2.36'. Suitable for various nuts, such as prism, square, and diamond nuts, these wrenches adapt to different specifications, meeting diverse needs. 3.Ergonomic Efficiency: Equipped with a TPR ergonomic handle, this pipe vise wrench ensures a secure grip at the strongest point, maintaining the user's wrist in a natural position. This design reduces work pressure, enhancing overall efficiency. 4.Smart Design Features: The hardened tail, also made of carbon steel, serves as a crowbar for prying or chiseling, adding versatility to your toolbox. The self-locking function on the heavy-duty quick pipe wrench streamlines usage, making it user-friendly and productivity-enhancing.