Automatic Children's Coverstitch Bottom Hemmer QK-300-4.The product is priced low and has a broad market application prospect.Features:(1)Automatic size identification, assorting and controlling. (2)Automatic start-stop, trim thread, align overlapping stitches and stack.(3)Adding seam position detection device to avoid error detectivity on fabric colour. (4)Same seam direction control mechanism achieves a real seam direction overflipping(except some special fabrics). (5)Correcting devices ensure the same seam directions are well aligned outside and inside.(6)Automatic hem width detecting with one button. Application: Jersey, Pique and Lycra and knitting fabric like Ice Cotton fabric Children's T-shirt, Polo Shirt, Tank, Thermal underwear.