Features: 1.Rotating sewing machine hook+flat gear, owns simple structure, stable quality and high efficiency. 2.Multifunctional rotating hook for household sewing machine, a good helper for bobbin. 3.Indispensable accessories for sewing machines, fine workmanship for long?term use. 4.Manufactured from premium iron material, can stand up to a lot of wear and tear, practical and durable. 5.Wonderful replacement for the previous old or broken one, easy to install. specification:Item Type: Sewing Machine Hook Material: Iron Color: Black+Silver Model: 153021 Diameter: Approx. 5cm/2.0in Application: Suitable for Singer Household Sewing Machine 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. PackageList:1 xSewing Machine Hook