Durable dualsize ratcheting chuck key designed for quick, reliable bit changes Key benefits Built to last: made from quality metal for wear resistance and long service life. Two sizes in one tool: small diameter 12.7 mm and large diameter 17.5 mm cover the most common drill chucks so you can use one key for multiple tools. Faster operation: positive/negative ratchet switch (forward and reverse) lets you quickly loosen or tighten the chuck without repositioning the key. Convenient doubleended design: both diameters are integrated into a single tool, reducing the need to carry multiple keys. Comfortable control: nonslip handle improves grip and makes it easier to apply torque safely and accurately. Function and compatibility Designed to fit most chucks that accept 12.7 mm or 17.5 mm keys. Use the ratchet switch to select forward (tighten) or reverse (loosen) for efficient, onehanded operation. Robust metal construction provides consistent performance across repeated use. Performance and practical advantages Speeds up bit changes and reduces downtime on the job. Provides reliable torque for secure bit clamping and quick release when needed. Compact, integrated design is convenient to carry in a toolbox or hang at the workbench. Typical use scenarios Workshop and home DIY: quickly swap drill bits on handheld drills and bench drills during woodworking or metalworking projects. Construction and maintenance: fast, repeatable chuck tightening and loosening on job sites when switching bits for drilling, fastening, or removal tasks. Automotive and equipment : change accessories on drills used for disassembly, drilling pilot holes, or reaming in confined spaces. Dimensions and care Small diameter: 12.7 mm; large diameter: 17.5 mm. Wipe clean after use and store dry to maintain ratchet performance and extend service life.