Innovative design - Zero offset extension design lets you reach fasteners in tight spaces without sacrificing leverage or maneuverability. For your tools - The socket extension supports switching between 3 adapters to fit your socket wrench or impact wrench (not included). Includes 3/8 to 1/4 square drive adapter and 3/8 to 1/2 square drive adapter. Easy to use - Lets you access hard-to-reach areas under the hood with minimal effort. The socket adapter set with extension is approximately 19 mm thick to fit into tight spaces. Quality you need - Made from durable aluminum to resist bending and breaking during prolonged, repeated vehicle maintenance work. Applications - Engine bay tasks where space is limited, such as tight accessory bolts. - Brake caliper, suspension, or exhaust work with restricted clearance. - General maintenance on compact cars or crowded engine compartments.