Features 1、Strong Metal: These serger knifes are made of premium metal material, which is strong and durable. 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 x Serger Knife