Features 1、Premium steel makes it strong and sturdy, and has a long service life. 2、Excellent workmanship, smooth and without burrs. 3、Replacement for the old or the bad,easy to install and use. 4、Erosion resistant, high strength and durability. 5、A good sewing machine accessories to make your work more efficient. Specification Features: Premium steel makes it strong and sturdy, and has a long service life. Excellent workmanship, smooth and without burrs. Replacement for the old or the bad,easy to install and use. Erosion resistant, high strength and durability. A good sewing machine accessories to make your work more efficient. Specification: Item Type: Serger Machine Knife Material:Metal Upper Knife Code:412585 Lower Knife Code:550449 Fitment: Fit for BABYLOCK SERGER MODELS-BL202,BL302,BL400 Fit for CONSEW:14TU854 Fit for ELNA SERGER MODELS:T-3,T-33,T-34,T-34D Fit for SERGE-MATE SERGER MODELS:300,430,SW432,4350D,5030,5949L Upper Knife Size(L x W):4 x 0.8cm / 1.57 x 0.31in Lower Knife Size(L x W):2.5 x 0.8cm / 0.98 x 0.31in Package List: 1 x Upper Knife 412585 1 x Lower Knife 550449 Package List