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Appliance manufacturers overwhelmingly use hex head screws, and a nut driver drives them faster and with far less damage than pliers or a socket on a ratchet in tight spaces. A 1/4-inch and a 5/16-inch will open the majority of American appliances. It is the single most used hand tool in the trade and costs very little.

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The longer version, with sizes to buy first. What is a nut driver.

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