M might be for markers, but it is also for Mat pack.
this little product is a fabulous invention!
It consists of a setting mat, a paper piercing pad, and a paper piercing template.
The "stabby thing" (lol an awl, or paper piercing tool) is available in the tool kit - otherwise a needle works just fine. Stick it in a piece of cork, and you are good to go!
the beauty of this set is that you an paper pierce any project, and know that your lines will always be straight.
You can also line up eyelet holes - jumbo or normal, or work out where your brads need to go to be straight.
Such a simple little thing, but so important for that professional finish.