Features: Enhancing your sewing efficiency with sewing machine spools, crafted from high strength aluminum for durability and corrosion resistance, ensuring long lasting performances in industrial settings. Featuring a unique grooved design, these spools improve thread winding, minimizing tangles and ensuring smooth operation across various flatbed sewing machines. Ideal for professional tailors, home sewing enthusiasts, and sewing machine technicians who demand reliable andaccessories to enhances their craft. Perfect for use in garment factories, studios, and educational sewing courses, providing a solution for diverse sewing needs and environments. With precise engineering and lightweight construction, these spools offer easy installation and replacement, optimizing your workflow and maintaining consistent stitching quality. Specifications: Texture: Aluminum Outer Diameter: Approx. 0.82inch(21mm) Inner Diameter: Approx. 0.23inch(6mm) Package Includes: 100x Sewing Machine Bobbin note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color from the item.