Description Overview Porter 504 double head border serger Model PE 504-DO Inventory number: E-6212 Machines are side by side Left and right sewing heads Operation Raw border is pulled directly from either cart or roll Serged borders feed directly to border cutter or windup unit Automatic thread break and material run-out detection Specifications Border width from 3 1/2" to 20" (89 mm to 508 mm) Material: up to 1/2" (12.7 mm) Speed: 6000 rpm @ 4.5 spi Yield: 40 +/- yards per minute Footprint: 54" x 112" (1.3 m x 2.8 m)