1. Strong Metal: These serger knifes are made of premium metal material, which is strong and . 2. High Efficiency: These overlock blades have helped many professional sewing processes, saving a lot of time and energy, thereby greatly improving efficiency. 3. Widely Compatible: These overlocker knifes are suitable for PL1500, PL2000, 925D, 935D, 929D, 1034D, 1134DW, 1634D, 2034D, 3034D, 925D, 929D, DZ123, DZ1234. For upper knife XB0563001 and lower knife X77683001. 4. Easy Installation: These serger blades can be easily installed, and they can trim your fabric beautifully. 5. 8 Pieces: 8 pieces of sewing machine blades are packed together, meeting your needs for sewing process. Specification: Item Type: Serger Knife Material: Metal Product Specifications: 8 Pieces Product Application: Household Use Application Scope: Most Scenarios Upper Knife Size: Approx. 38 x 13mm / 1.5 x 0.5in ( Manual Measurement, Slight Error May Exist ) Lower Knife Size: Approx. 41 x 8mm / 1.6 x 0.3in ( Manual Measurement, Slight Error May Exist ) Package List: 8 xSerger Knife 8 Pieces 8 pieces of sewing machine blades are packed together, meeting your needs for sewing process. Easy Installation These serger blades can be easily installed, and they can trim your fabric beautifully. Strong Metal These serger knifes are made of premium metal material, which is strong and . High Efficiency These overlock blades have helped many professional sewing processes, saving a lot of time and energy, thereby greatly improving efficiency. Widely Compatible These overlocker knifes are suitable for PL1500, PL2000, 925D, 935D, 929D, 1034D, 1134DW, 1634D, 2034D, 3034D, 925D, 929D, DZ123, DZ1234. For upper knife XB0563001 and lower knife X77683001.