It is a long 21 mm socket with a 1/2-inch drive is a deep socket designed to fit 21 mm nuts and bolts and reach fasteners in recessed or hard-to-access areas.

Uses:

• Tightening and loosening 21 mm nuts and bolts.
• Removing and installing wheel lug nuts on many vehicles.
• Accessing deep-set fasteners in automotive and machinery applications.
• Maintenance and repair of industrial equipment.
• Assembly and installation of mechanical components.
• Working in confined spaces where extra socket depth is required.