One of the most commonly used tools in aviation is the slip-joint pliers. These pliers come in lengths from approximately four inches to more than nine inches. The six inch size is the most commonly used. Slip-joint pliers gets their name from the double hole used at the pivot. This double hole design allows the jaws to work in either of two positions, increasing the range of material that can be gripped.
Slip-joint pliers are exceptionally versatile tools. However they should only be used for their specific intended purpose, which is to hold things. You should never use slip-joint pliers to turn a nut as they will invariably round off nut corners. This is especially true of tubing nuts which are made of a soft aluminium or brass.
See figure 1 for example.
(Figure 1)
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