Item Type: Sewing Machine Hook_x000D_ Material: Iron_x000D_ Color: Black+Silver_x000D_ Model: 153021_x000D_ Diameter: Approx. 5cm/2.0in_x000D_ Application: Suitable for Singer Household Sewing Machine_x000D_ Operation: Most of these sewing machines use rotating hook, which hook the thread loop with its tip while expanding the thread loop and guiding the thread loop around the bobbin to form a lock stitch. 1Rotating sewing machine hook+flat gear, owns simple structure, stable quality and high efficiency. 2Multifunctional rotating hook for household sewing machine, a good helper for bobbin. 3Indispensable accessories for sewing machines, fine workmanship for long?term use. 4Manufactured from premium iron material, can stand up to a lot of wear and tear, practical and durable. 5Wonderful replacement for the previous old or broken one, easy to install.1 xSewing Machine Hook