A spanner or wrench is a tool used to provide a firm grip in applying relatively force to turn objects such as bolts and nuts. The turning could be either tightening or loosening of a fastener.
The most common shapes of spanners are called open-ended and ring spanner.
The diagram below shows a set of wrenches or spanners with open-ended and ring shapes.
NOTE: As an Installer, you need to have a wrench set or spanners so as to make you efficient in your work.
Another type of spanner that can be used is called Adjustable or Shifting Spanner. The picture is displayed below.
With this type of spanner, you can equally do the work very well.