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The Hilmor quick-change magnetic nut driver is 2 tools in 1, allowing you to switch from 1/4” to 5/16” with ease. It features a magnetic tip for a secure hold and deep shaft for long bolts. It even offers a color-coded insert for quick identification, a slip-resistant grip for more torque and chrome-vanadium steel construction for extra durability. Its compact design makes it handy in some of the most complex scenarios. This nut driver has advanced, enhanced, and reliable features due to its simplicity. There are countless on the job advantages relevant to any technician. This quick-change magnetic nut driver is a necessity for any HVAC technician.