Saw Guide
The Saw Guide is used for cutting Straight boards such as
your
treads and
risers. It can also be used to rip long 2x materials, for instance
if you have a 2 x 12 and need some 2 x 6 you can set the saw guide up on
your circular saw to 5 - 1/2 inches and
rip 2 - 2 x 6 boards out of 1 - 2 x 12.
The saw guides you get like the one in the picture will
only cut widths up to 7 inches.