A good pair of wire strippers is a must for electrical work, but you don't necessarily need to spend a ton of money on them if you buy from Harbor Freight.

Whether you're installing, extending, or rewiring a circuit, finding out the wire gauge and amperage you will need is a key ...

Just bare wire. There is another guide that lets you control how much insulation the tool removes along the length of the wire. The idea is you insert the wire until it hits the guide and then ...