842/872 can be applicable to sewing shirts, habiliment, jeans, overcoats etc. The applicability is strong of sewing materials and synchronized feeding of needle and feed dog. Which can prevent slippage between layers of materials, they can perform two- row of parallel stitching and decorative seaming with quality.
845/875 have structure of two-needle split needle. It is very convenient to make comer seam as well. Feeding in phase needle and feed dog is helpful for wonderful and nice stitch, against any glide of materials. Suitable for lady's underwear, jeans, overcoat etc, decoration and corner seam inclusive.