The Central Tools OP202A Interchangeable Torque Wrench Head is a replacement open‑end head designed for torque wrenches that accept SAE ‘A’‑size interchangeable heads. This model features a 5/8-inch open‑end opening, making it suitable for applications requiring precise torque application on 5/8" fasteners. It installs quickly onto compatible torque wrench bodies, maintaining consistent accuracy and durability for professional mechanical, assembly, and maintenance tasks.