Wire strippers come in many sizes and designs, but those intended for electric power wiring feature special blades to cut wire insulation on American Wire Gauge (AWG) #16 to #10 while leaving the conductor wire intact and without nicks.
A simple manual wire stripper is a pair of opposing blades much like scissors or wire cutters. The addition of a center notch makes it easier to cut the insulation without cutting the wire.
Another type of manual wire stripper is very similar to the simple design previously mentioned, except this type has several notches of varying size. This allows the user to match the notch size to the wire size, thereby eliminating the need for twisting.
When engaged, an automatic wire stripper simultaneously grips the wire from one side and cuts and removes the insulation from the other. To use it, one simply has to place the wire in the jaws and squeeze the handle.