Sew Steady / Westalee Cross Hairs Ruler
8.5" Crosshair Square is for marking 4x(90°), 8x(45°), 16x (22.5°), or 32 x(11.25°) on block sizes up to 8"reference lines
8.5" Crosshair Square is for marking 4x(90°), 8x(45°), 16x (22.5°), or 32 x(11.25°) on block sizes up to 8"reference lines