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 machine 2. 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 machine 3. Steel Construction: Made from sturdy steel material, these sewing machine blades have high hardness, wear resisting and tear resisting, ensuring long lasting durability and performance 4. 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 users 5. 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 productivity Specification: Item Type: Sewing Machine Blade Product Material: Steel Upper Blade Size: Approx. 4.5 x 1cm / 1.8 x 0.4in Lower Blade Size: Approx. 2.7cm / 1.1in Application: 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 Blade 1 x Lower Blade