Creative Grids Half-Square 4-in-1 Triangle Ruler
Dual-purpose: Use vertical, horizontal & diagonal lines to square up any 6-1/2in pieced, appliqued or embroidered block. To fussy cut, center a design in the 1in - 6in solid squares. The drilled holes at 1-1/2in - 5-1/2in increments lets you mark & add the seam allowance to fussy cut pieces.