Lock Washers are very efficient in safeguarding the bolts and nuts from getting loose and slipping away which is a possibility and is obvious due to the high torque and friction. These tend to serve several other minor functions too apart from the main concept of holding. These come along with a key that prevents the rotation and also eases the fastening. These are generally placed below fasteners and also holds other washers. Lock Washers are very easy to install and also to remove. All you need to remove them is just use a socket or wrench to do the required.