Left Spring Edge Guide Top-Stitch Foot Set For Adler Industrial Walking Foot Machines. This foot set is available in sizes : 1/8" (3mm), 5/32" (4mm), 3/16" (5mm), 1/4" (6mm), 5/16" (8mm) This foot set contains one outside foot and one inside foot. The outside foot has a spring loaded left side guide that maintains straight top stitch on leather or upholstery fabrics. This foot is designed for all kinds of general work on leather, upholstery, canvas, etc. This high quality edge guide foot set will fit Durkopp Adler industrial sewing machine models : 367, 467, 767