A quilt consists of two layers of fabric with a layer of batting sandwiched between them. Many pieces of fabric can be joined together in continually changing patterns to form the top layer of the quilt. The 1/4 inch Quilting Foot is particularly suitable for joining these pieces of fabric. The clearance between the needle and the outer edge of the foot is 1/4 inch (6.3mm) and between the needle and the inner edge of the foot 1/8 inch (3.15mm) - See more at: http://www.pfaff.com/en-US/Accessories/1-4-inch-Quilting-Foot-for-IDT-System#sthash.OTPpTWIW.dpuf