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 .