Features: 1.Durable and Reliable: Made of premium Q235 steel, these sewing machine hooks and bobbins are built to last for long term use. 2.Perfect Fit: Designed to fit various for Singer sewing machine models including for HD 4452 6380 6360 44S 64S 725 4432 4411 4423. 3.Easy to Install: The hook has a screw diameter of 1.2cm, making it quick and effortless to install on your sewing machine. 4.Sturdy Construction: The plastic exterior of the hook provides extra protection while maintaining a smooth operation for your sewing machine. 5.Bobbin Case: The 3.9cm diameter bobbin case ensures proper thread tension and helps prevent thread tangling for reliable stitching. specification:Item Type: Bobbin Case Shuttle Hook Set Material: Q235 Steel, Plastic Product Size: Hook Plate Size: Outer Diameter Approx. 4.5cm/1.8in, Height Approx. 1.4cm/0.6in, Stud Diameter Approx. 1.2cm/0.5in Bobbin Case Size: Diameter Approx. 3.9cm/1.5in PackageList:1 x ShuttleHook 1 x BobbinCase NoteAll data are measured manually, and there are certain errors in the measurement results.