1 SET~SINGER INDUSTRIAL WALKING FOOT SINGLE PIPING WELTING FEET~#S32~size 5/16" ONE SET PER ORDER SINGER WALKING FOOT SINGLE WELTING PIPING FEET #S31 5/16 OUTSIDE FOOT #S30 INSIDE FOOT (FOR SIZES 1/8" TO 3/8") WE ALSO CARRY SIZES:1/8", 5/32", 3/16", 1/4", 5/16", 3/8", 1/2", 5/8", 3/4".