Welt Foot Set With Double Toe Outside Foot For Industrial Adler Walking Foot Sewing Machines. Each set contains one outside foot and one inside foot. Outside foot has a double toe which secures the fabric in place in between feeding. Cording groove on the left of the sewing needle. This presser foot gives you a professional finish whether the welt cord or piping is purchased pre-covered or you cover it yourself. We carry 4 different sizes on this type of welt foot. Please select from following available sizes. 5/32" (4mm), 3/16" (5mm), 1/4" (6mm), 5/16" (8mm) Fits Adler models : 367, 467, 767 Class walking foot machines.