Fons & Porter Quarter Inch Seam Marker
Mark 1/4" sewing lines on patchwork pieces with this nifty set of tools - Quick and easy method for half-square triangles and hourglass units - Instructions for two patchwork blocks included. Two piece tool set includes 1-8" and 1-12" tool.
click here. for a pdf with instructions on how to use your rulers! (Right click and select "Save As" to save on your PC.)