100 Organ ELX705 SY2922 Flat Shank Home Serger Needles (Size 14 (metric 90)) Box of 100 ORGAN ELX705 Home Serger / Cover Stitching Machine Needles. Needle System : ELX705 (Same as SY2922 & 2022) One side of the shank on these needles is flat and the other is round. It has 2 grooves, a slightly longer scarf and a light ball point. If your serger calls for a 15X1 needle and is breaking threads, the 2nd groove on this needle may solve your problem. If your serger takes a flat shank needles, then these needles will fit your serger.