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The Jacobs Chuck Key is an essential tool designed for 1/4" to 3/8" drill chucks, ensuring easy and efficient tightening or loosening of drill bits. Crafted from durable steel, this chuck key features a 1/4" pilot for a secure fit, making it perfect for both professional and DIY applications. Its robust construction guarantees longevity and reliability, making it a must-have for any toolbox.