36069DG Double Piping Foot, available in sizes 1­/8", 3­/16" and 1/4".  For all standard flatbed lockstitch industrial sewing machines.

For the following sewing machines (and many more):

• Brother DB2-B735, B755, B737
• Diamond 8500N, 8500-D3, 8800A and 8800A-D3 
• Janome 1600P
• Singer 191 & 591
• Toyota 140, 150 & 158

Will not fit on needle feed machines.