They are for cutting wire.
Pliers that cut are called "Alicates de cortar".
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Diagonal pliers (alos called wire cutters or diagonal-cutting pliers) are pliers intended for the cutting of wire (they are generally not used to grab or turn anything). They are sometimes called side cutting pliers or side cutters, although these terms are shared by other pliers designs, such as lineman's pliers, and may lead to confusion. The plane defined by the cutting edges of the jaws intersects the joint rivet at an angle or "on a diagonal", hence the name. Instead of using a shearing action as with scissors, they cut by indenting and wedging the wire apart. The jaw edges are ground to a symmetrical "V" shape; thus the two jaws can be visualized to form the letter "X", as seen end-on when fully occluded. The pliers are made of tempered steel and inductive heating and quenching are often used to selectively harden the jaws.
Wire
diagonal cutting pliers
It raises the handles so that a cut can be made flush with a flat surface.
"I used the pliers to cut the wire"
Pliers are generally classified by their intended use.
I find it easiest to cut chicken wire with aircraft style sheet metal shears. -It could be done with diagonal pliers or wire cutters, but that's a lot more effort.
Use Pythagoras: Diagonal² = √(2 × sidelength²) → diagonal = side_length × √2 → diagonal = 12 × √2 ≈ 17.0 units
Kitty-corner is another term for diagonal. A right triangle's hypotenuse is on a diagonal. On a keypad, the five is on a diagonal from the nine.
They can get in and out of tight spots, unlike regular pliers.