Mechanical pliers are pliers that are used in mechanical jobs, like fixing motor parts, auto parts, machines , etc.
A pulley or pliers
You can grip things tightly with them.
"I used the pliers to cut the wire"
Pliers are generally classified by their intended use.
I have used and seen many pliers of all kinds. Never heard of that name before. In general all pliers are used to grip ,hold or cut things, each with a slightly different usage.
They can get in and out of tight spots, unlike regular pliers.
It is impossible to say exactly when pliers were invented.Wooden, and then bronze, pliers were in use sometime before 3000 BC.3000 BC
They are for cutting wire.
All technicians, electricians, plumbers and handymen use pliers almost every day.
A pair of pliers, as the name implies, consists of two levers working together to give the user a tighter grip than would be available with bare hands. Understanding how those levers function and interact can make for a child's science project, or simply help a workman understand the tools of his trade. - Xavier Nairne From Mona Preparatory/ Wolmers Boys.