C&T Publishing-Fast2mark Tools Essential Circle Tool. Get ahead of the curve with the ruler that makes set-in circles, half-circles and Drunkard's Path blocks so simple! Its slotted grooves, clear measurements and precise 1/4 inch seam allowance will save you the hassle of drafting your own circle pattern. This 14x10-1/2 inch package contains one circle tool that makes set-in circles measuring between 2 inches and 8 inches and instructions. WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Do not mouth or chew. Imported.