This machine adopts link-typed feeding mechanism,needle bar thread taking up,and looper thread catshing to produce two lines of chainstitch,which is firm and elastic,suitable for lapping seam and decorative seam on garment,underwear,bedding articles and leather goods.there are five different gauges available for selection. KX8310 is high speed single needle chainstitch sewing machine KX8310 is vertical two needle chainstitch sewing machine. KX8310 1.4-4mm TV?9 #-16# 4500s.p.m. 6.4mm 5.5 370 66.5?24.5?8.6 KX8300 1.4-4mm TV?9 #-16# 4500s.p.m. 6.4mm 5.5 370 66.5?24.5?8.6