The ¼” Ruler Foot was specifically designed to use for ruler work using Janome quilting rulers. The ¼” cup height moves smoothly alongside the quilting ruler without allowing the ruler to slide over or under. With this foot, the needle drops a ¼ inch away from the ruler to create the quilting line. * Using the straight stitch needle plate is recommended for better results when using high/low shank horizontal rotary hook models. Foot is compatible with low shank models 2030QDC, 3160QDC, 4120QDC, 49018, 5300QDC, DC1018, DC1050, DC4030P, JW8100, M7050, M7100, M7200, MOD-100, MOD-200, MOD-30, MOD-50, NH60, TS100Q.