Sewing spool size: single sewing spool diameter 20mm, height 10mm, center hole diameter 6mm. If your original spool hole diameter is 6mm, then our product is suitable for your machine. Box size 118 x 97 x 24mm. Sewing machine spools. Scope of application: high-quality general sewing machine spool, very suitable for sewing factories, household sewing machines, gathering and sewing threads, DIY and other projects. Compatible with all common household sewing machines. Sewing machine spool material: high-quality sewing spools made of high-strength plastic have a longer service life and can be reused. and transparent sewing spools do not affect the real color of the sewing thread. Scope of delivery: includes 25 sewing machine spools, 1 transparent storage box for perfect storage of sewing machine spools. Note: The data is all measured manually, please allow an error of 1 to 3 cm. Due to differences in light and display, there may be color differences, please refer to the actual item