I love the slotted rulers. I have 2 of the 12 x 12. I have the 18", the 1/4" slots, and the one that cuts in 1//8s. Even have the ones for fringe. I found the one that cuts the Half square triangles the other day hanging behind all my other slotted rulers. Funny thing is, a group of us are getting ready to do a scrappy quilt that uses the 6 1/2" triangles so I was so happy to find a ruler I already had.