The Nutdriver has Officially Advanced and it's done it through its Simplicity. The 1839054 1/4" and 5/16" Quick Change Magnetic Nut Driver is 2 Tools in 1, Allowing you to Switch from 1/4" to 5/16" with Ease. And, after you have your Size Selected, it Gives you Quite a Few other on-the-job Advantages like a Magnetic Tip for a Secure Hold and Deep Shaft for Long Bolts. It even offers a Colour-Coded Insert for Quick Identification, a Slip-Resistant Grip for more Torque, and a Chrome-Vanadium Steel Construction for Extra Durability