Function: 1. There are 18 different sizes of watch pins, each size contains 20 pieces, which can meet different needs 2. Stainless steel hand spring has double arms and can be used for metal belt links 3. These strap needles are stored in a clear storage box to separate 18 different sizes of bracelet needles for easy use and storage 4. High-quality stainless steel material can ensure the durability and stability of the pins 5. Professional design and reasonable structure, good watch repair accessories . SET OF 20 PIECES, SIZES OF WATCH PINS . SET OF 20 PIECES, SIZES OF WATCH PINS Specification: Item Type: Watch Pin Material: Stainless Steel Purpose: watch repair parts Including sizes (each length has 20 pieces): About. 6mm / 0.24 inch 7mm / 0.28 inch 8mm / 0.31 inch 9mm / 0.35 inch 10mm / 0.39 inch 11mm / 0.43 inch 12mm / 0.47 inch 13mm / 0.51 inch 14mm / 0.55 inch 15mm / 0.59 inch 16mm / 0.63 inch 17mm / 0.67 inch 18mm / 0.71 inch 19mm / 0.75 inch 20mm / 0.79 inch 21mm / 0.83 inch 22mm / 0.87 inch 23mm / 0.91 inch List of packages: 360 x Watch Pin 1 x Storage . SET OF 20 PIECES, SIZES OF WATCH PINS . SET OF 20 PIECES, SIZES OF WATCH PINS