The BLACK & DECKER IRWIN J7212L is a 3/8" drive impact lock extension designed for durability and efficiency. This 12-inch extension is crafted from high-quality materials, ensuring it withstands heavy-duty use. Its impact-rated design allows for optimal performance with impact wrenches, making it ideal for automotive and industrial applications. The extension features a secure locking mechanism that ensures a tight fit with sockets, preventing slippage during operation. Compatible with various 3/8" drive tools, this extension is a must-have for professionals and DIY enthusiasts alike.