Reference lines give much more accurate spacing when quilting, particularly when using rotating templates. On a domestic machine the quilt is not taught as on a long arm machine and their is movement of the quilt sandwich which can make it difficult to use the rotating lines on the templates. Use the 8-Point CROSS HAIR SQUARE to locate the center and mark 4, 8, 16 and 32 lines if required. - Same as WA-CHS8PT-12.5 - Westalee Design