B2421-280-0A0 is the moving knife of LK1850 and LK1900.
Our company are specialized in industrial sewing machine knives  and embroidery machine knives .Our productions are in high quality which can compare with Strong H and Golded eagle  ,while our prices are much cheaper than them. If you can supply us with the samples and drawings ,we also can make the new productions for you in one or two months.)