12 4-20)What types of pliers are primarily used for mechanical HVACR work?
4-21)Electrical pliers should only be used for cutting what material?
4-22)How is cutting accomplished when using a hacksaw?
4-23)How are files and vises used in refrigeration work?
4-24)What are hand seamers, and when are they used?
4-25)What are the three different types of aviation snips?
4-26)How does a nibbler work?