Extension rod with a double color handle provides secure bit retention and corrosion resistant performance through full body quenching treatments, ideal for repetitive screwdriving applications Designed for mechanics, electricians, and enthusiasts requiring reliable torque transmission in automotive , electronics assembly, and household maintenance tasks Suitable for confined workspace scenarios requiring tool versatility, from furniture assembly in homes and workshops to machinery servicing in professional garages The hexagonal shank bit holder set features a quick release selflocking mechanism and forged steel construction, ensuring durability and deformation resistance for professional fastening tasks Use scenario: Automotive in tight engine bays where secure bit retention and reliable torque transmission are essential Use scenario: Electronics assembly involving small components and restricted access, requiring precise torque and dependable bit hold Use scenario: Home furniture assembly and workshop tasks in confined spaces, enabling versatile fastening across multiple projects