Pliers are namely ordinary needle nose and special type of hand tool used to hold objects tightly. Fig. 1 (a) shows a long nose pliers and Fig. 1 (b) shows a combination pliers. These are commonly used by fitter and electrician for holding of wires, hot metals. Pliers are also useful for bending and compressing a wide range of materials.
Screw driver is a screw tightening tool. The most commonly used variety of screw drivers are shown in Fig. 2. It is generally used by hand for tightening the screws. A simple screwdriver has a handle, a shank, and a tip that the user inserts into the screw head to turn it.
Wrenches are commonly known as spanners, are used to provide grip in applying torque to turn objects usually rotary fasteners, such as nuts and bolts or keep both of them from turning. These generally come in sets and are commonly identified by size numbers. These are of various types and few general types involve open single ended, open double ended, closed ended adjustable, ring spanner, offset socket, t-socket, box wrench, pipe wrench and Allen wrench.