The motor is an electric or fuel powered compressor component that moves a piston in a cylinder to produce the compressed air­­

The movable blade guard is a safety feature of a saw that covers the spinning blade when not in use and moves out of the way as material is passed through it

A mullion is a vertical structural divider that separates multiple windows in the same unit

The multi fire setting on a nail gun allows multiple sequential nails to leave the gun with the trigger held each time the safety tip is pressed to the surface