This 100 mm extension bar with a 3/8-inch (9.525 mm) square drive enhances reach and accessibility for socket spanners, enabling efficient work in confined or recessed areas. It provides secure attachment and reliable torque transfer, suitable for professional automotive and mechanical applications. Key features: - Length: 100 mm for improved access - Square drive size: 3/8 inch (9.525 mm) - Compatible with standard socket spanners - Ball-type retention mechanism for secure socket holding - Ideal for precision tasks in tight spaces