Comprehensive and versatile This 147piece watch tool set includes every tool needed for a wide range of watch tasks, from opening watch backs to adjusting ss and c batteries, making it suitable for both professional and home use. Easy to use The kit includes an oversized case key that opens cases up to 52 mm, along with user friendly tools like a small hammer, screwdrivers, and tweezers, making watch tasks straightforward and efficient. Materials and durability Made from robust metal, this tool set offers durability and reliability, ensuring long lasting performance for all your watch maintenance needs. Convenient and portable Comes with a durable black canvas carrying case with a zipper, allowing you to easily store and transport your tools, enabling repairs anywhere and at any time. Use scenarios Replacing watch batteries at home or on the go Opening watch backs for maintenance and inspection Adjusting bands and bracelets using screwdrivers and small tools