Cutex (TM) Brand 30 Bobbins for Singer 20u / Brother B651 / Juki Tl-98q Set of 30 Brand New Metal Bobbins for Singer 20U, Juki TL-98E/TL-98Q and many other models of industrial and home sewing machines. The bobbin #55623. This bobbin diameter measures 21mm and 9mm thick. Bobbin size : 28.0mm diameter X 11.0mm thick This bobbin is used on many Single Needle, Zig-Zag Stitching, Embroidery and Household sewing machines.