1/4-Inch Seam 1/2- Inch Seam Square feet are designed to aid in achieving straight seams while piecing on your quilting frame. these feet can be used as a guide for consistent seam allowances. Your machine should already be fitted with the Handi Feet mount that works with the interchangeable Handi Feet. HQ longarm machines manufactured prior 2014 will need to convert from the original hopping foot to the Handi Feet mount using the Handi Feet Conversion Kit (QM00841).