Feature:1. Upper Lower Blade Set: The set provides an upper blade and a lower blade to help you trim the sewing fabric, providing a smoother and stable cutting experience on sewing machine2. Compatibility: Suitable for 204D, 504D, 634D, 644D, 888, 1110DX, 3434D, 7034D, 7933, for Harmony, 8002D, 9102D HF504D, for Elna 664, for 752, 4752 and other overlock sewing machine3. Steel Construction: Made from sturdy steel material, these sewing machine blades have high hardness, wear resisting and tear resisting, ensuring long lasting durability and performance4. Easy to Install Replace: Designed for convenience, these sewing machine blades are compact and lightweight, facilitating easy removal, installation, and maintenance for a wide range of users5. Replacement Parts: Replace old or damaged sewing machine blades with this upper and lower blade set to ensure stable and efficient work of your machine, enhancing your sewing productivitySpecification:Item Type: Sewing Machine BladeProduct Material: SteelUpper Blade Size: Approx. 4.5 x 1cm / 1.8 x 0.4inLower Blade Size: Approx. 2.7cm / 1.1inApplication: For 204D, 504D, 634D, 644D, 888, 1110DX, 3434D, 7034D, 7933, for Harmony, 8002D, 9102D HF504D, for Elna 664, for 752, 4752, for 385.16655100.Package List:1 x Upper Blade1 x Lower Blade