The characteristic is it has double grooves and has no scarf. 4 types point with R, KN, BP.
It is mainly for zipper chain stitch machine use.
It is s suitable for two needle chain stitch, interlock stitch for knitted good.
Equivalent systems include: UY121GS; UYX121; 62X21; MY1001; SY3510; 759; 1628.
