FREE DELIVERY Hem that skirt or sew stretch fabrics ... does that seem difficult for you? Not with the Elna 664PRO! Do you want something to complement your sewing machine? With the Elna 664PRO you can sew with 2, 3 or 4 threads. The program reference panel will tell you how to adapt your machine for each selection. You can also join seams ... in a jiffy ! TECHNICAL FEATURES Built-in program reference panel Automatic tension release Built-in 2-thread converter Tilting needle clamp Instant rolled hem device Self-threading lower looper Front cover safety system Pre-tension slider ( 3/4 - 2 thread ) Color-coded threading routes Cutting blade Adjustable foot pressure Telescopic thread antenna system Electronic foot control Waste tray included Exclusive Elna accessory box Dust cover