The Perfect ¼" Foot is designed to help you achieve a ¼" (6mm) or scant ¼" (5.9mm) seam when piecing. The needle hole in the foot is oval shaped allowing you to adjust the needle position. The distance between the center needle position and the guide is less than ¼ (6mm). Fits group B, C, D, E, F, G, J, K, L