Chuck Key - Three sizes available: 15/64 in, 1/4 in, and 17/64 in. This range allows you to match different chuck openings without carrying multiple tools. - Pilot design for easier engagement. The pilot feature helps align the key with the chuck for smoother operation and reduces the chance of slipping during use. - 15/64 in size suitable for precise applications. This smaller dimension is selected when a precise fit is required for accurate chuck engagement. - 1/4 in size provides versatility for a wide range of tasks. A common size that covers many standard chuck applications. - 17/64 in size adds another option with its unique dimension. Expands compatibility with chucks that require this specific size, giving you more choices in one product. Use scenarios - Quick bit changes on a handheld drill or drill press where a precise engagement is needed for secure bit retention. - Precision chuck tightening on a small milling machine or metalworking setup, using the 15/64 in size to support accurate alignment. - General workshop maintenance and tool setup, where having the 1/4 in or 17/64 in size on hand reduces downtime when different chucks are encountered.