Hook rulers have been around for ages. They're advantage is the ability to quickly and exactly reference the starting edge of a board. Woodpeckers has taken this idea and developed a simple hook that attaches to Woodpeckers' Woodworking Rules*. The Hook Stop is especially helpful when working with longer rulers.
Imagine being two or three feet away from the zero end of the ruler, rather than stretching to try and keep the zero end flush with the boards edge, you can simply hook that end onto the board and away you go.
Simple and effective. Like all Woodpeckers tools, made in the USA, just outside Cleveland, Ohio.
* The Hook Stop is not compatible with older Woodworking Rules as well as any vintage 6”. The way to know is to look at the top for two threaded holes located at 1/4” and 3/4”. If the threaded holes are there than the Hook Stop will attach. Rulers purchased after 12/1/2011 should have the holes in them.
WARNING: Cancer and Reproductive Harm—www.P65Warnings.ca.gov