Sewing machine accessories: two blades (bottom and top) for the sewing machine. The replacement of the upper and lower blades ensures a smooth fabric cut. Make your work more efficient. Sturdy material: high-quality steel makes the tiger blade robust and durable and has a long service life. Corrosion resistance, high strength and durability. Exquisite craftsmanship, smooth and no burrs. Practical replacement: both old and bad are perfect replacements. Easy to install and use, precise angle blade ensures smooth sewing and good cutting effect. Note: Due to the sharp edges of the knives, it is not recommended to keep these sewing machine blades within the reach of children. WIDE COMPATIBILITYUpper knife code: 412585; Lower knitting code: 550449, suitable for multi-brand sewing machines. The new blade improves the efficiency and aesthetics of sewing fabrics.