RONDA'S CURVED CRESCENT MOON Large 18 1/8" x 7 3/4"Designed by Ronda K Beyer, Ronda's Rulers make curved crosshatching a breeze with NO marking. There are 1 4 inch and 1 2 inch markings to help keep the crosshatching uniform. The large Curved Crescent Moon is ideal for crosshatching large blocks. Laser cut from 1 4 acrylic. Safe to use on Long , Mid , and Short arm machines as well as High Shank Home machines with the appropriate ruler foot attached. Make sure your ruler foot will clear 1 4 inch