Feature: 1. WATCH MAINTENANCE TOOL: This capping machine die is a professional grade accessory designed specifically for watch repair tasks. With its advanced design, it's suitable for handling watch repair needs for watchmakers. 2. MULTIPLE SIZES FOR VERSATILITY: Equipped with die diameters of 36.7mm, 39mm, 38.7mm, 41.7mm, and 42mm on the upper side and 32.7mm, 41mm, 43.1mm, and 46mm on the lower side, this tool ensures compatibility with different watch sizes. 3. WIDE COMPATIBILITY: This back cover cover tool is suitable for a variety of popular watch brands including, ensuring a broad range of applicability for watch repairs and maintenance tasks. 4. BEZEL OPENING AND CLOSING: Specially designed to open and close water resistant grooved watch backs, this tool is suitable for handling intricate tasks with precise, ensuring the safety of your valuable timepiece during maintenance or repair. 5. INCLUDED ACCESSORIES: Comes with ten groove clamp heads to accommodate different types of watches. Whether you're a professional watchmaker or a watch enthusiast, this complete tool pack is all you need for your repair and maintenance tasks. Specification: Item Type: Watch Capping Machine Dies Material: Metal Upper Die Inner Diameter: Approx. 36.7mm / 1.45in, 39mm / 1.54in, 38.7mm / 1.52in, 41.7mm / 1.64in, 42mm / 1.65in Lower Die Inner Diameter: Approx. 32.7mm / 1.29in, 41mm / 1.61in, 43.1mm / 1.70in, 46mm / 1.81in. Package List: 6 x Upper Dies 4 x Lower Dies 1 x Plastic Box