The Sure Foot has a taller profile than the standard ruler foot and provides additional stability when using rulers. Quilters will enjoy the extra support while doing ruler work, as well as more needle visibility due to small cutouts in the foot. IMPORTANT: If your machine didn't come already equipped with the Handi Feet mount, you need to convert from the original hopping foot to the Handi Feet mount using the Handi Feet Conversion Kit (QM00841).