DescriptionSuitable for sewing machine 925D, 935D, 1034D and other models to ensure smooth sewing and cutting.Made of strong metal, it will not rust, the blades is sharps, and the cutting is fast without residue. It is the best substitute for the old Serger blades, with fine craftsmanship and smooth polishing.Features- Material:Metal.- Hook Blades Size: 4.00X0.80X0.20cm/ 1.57X0.31X0.08in.- Diagonal Blades Size: 3.80X1.30X0.30cm/1.49X0.51X0.11in. - Replacing the upper and lower blades will ensure smooth and skilled fabric cutting. - The sharps blades ensures that you can cut the fabric smoothly and the cutting line is neat. - Using professional technology to ensure the long-term use of the product. - Accurate hook and oblique blades ensure that you can complete perfect sewing everyday. - It is suitable for professional and sewing workers and can bring a lot of convenience to your work.