It is a small steel part forged with the same hardness and shape characteristics as the mobile jaw
The heel jaw is mounted on the wrench's body and is fastened with a pressure-fit steel pin that goes through the holes, fastening the jaw to the body
This unique design is mainly used in repairs and maintenance of refrigeration systems, where often times the nuts or couplings are made from soft materials, thus the importance of having a perfect fit, to avoid damaging the parts
They help tighten or loosen pipe joints made mainly with soft metals, like bronze, copper and aluminium
They have an ergonomic geometry that improves grip and fastening since their openings are precision-cut