High Quality: This high quality watch repair tool kit suit for both professional and general use, solutions for most watch repair. Multifunctional: Perfect set for very common tasks like opening watch backs, watchband adjustment, changing watch batteries, gaskets, adjusting bands, and more. Utility: Small, clean, and functional. This watch repair tool kit helps you get your watch problem done at home instead of going for watch repair shops, it's really a good way to save your money. Convenient: Come with a black carrying zipper case for the sake of convenient storage, easy to take care of them and get the job done by anywhere. Use: Perfect for watchmakers, collectors. Durable, portable, practical ,convenient and very easy to use. Adjustable screw back case opener suitable for watches with diameter of 16mm~38mm. Name:watch repair tool kit 6 watch strap spring-pins each of size Watch Strap Spring Pin Size: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 and 25mm Colour:As Shown Material:plastic+Metal Package Contents: 1set x watch repair tool kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.