This ruler from Creative Grids also has the ingenious anti-slip backing, which grips perfectly under pressure and thus prevents annoying slipping when cutting. Use this ruler to make perfect Log Cabin, Half Log Cabin or Courthouse Steps blocks up to 10 inches in size. The markings come in two spacings, so you can make 1 inch and ½ inch wide strips -. and the highlight is that you can combine both and also vary the overall size and size of the center square! Look at the product presentation linked here, then you get to know the almost infinite design possibilities.