Creative Grids Non Slip Single Strip Tumbler Ruler
Use the straight side of this ruler to cut 1-1/2in and 2-1/2in strips. Sew these strips together to create a 2-1/2in wide strip set. Turn around the ruler to cut tumblers that finish 2in. The holes in the ruler enable the rotary cutter to cut the tumblers without damaging the ruler.