Marti Michell Rulers are the perfect tool for quilters. They have smooth edges and are crack resistant. They are also made of clear acrylic, so you can see exactly what you are cutting. Log Cabin 1/2" & 1" Finished Size- For making Log Cabin Blocks up to 13.5" square. Use this ruler to rotary cut squares and strips to the exact length for perfect Log Cabin blocks. Ruler measures 3" wide and 14.5" long with different markings on edges. One edge has markings starting at 1.5" and increasing by 1" up to 13.5" while the other edge starts a 1" and increase by 1/2" up to 13.5".