This is a simple tool I designed for my child to help with handwriting.
It allows adding a ruled section to a worksheet or other piece of paper, giving hints about where the bottom, middle, top, and hanging part of each letter go and helping to keep things in a straight line.
To use, place the guide on the paper and lightly drag a pencil over each groove. Then remove the guide and write your answer.
The author hasn't provided the model origin yet.