Adjustable Watch Case Back Opener Remover Tool, Blue Metal Portable, Waterproof Screw-on Backs, Sturdy Solid Steel Build for Compact Repair Use Q:What is this tool used for? A:It opens waterproof watch case backs for battery changes and repairs. Q:What material is this opener made from? A:It is made from durable solid steel with a blue finish. Q:What is the adjustable jaw range? A:The jaw adjusts from 8mm to 57mm for different watch sizes. Q:Is this tool easy to carry? A:Yes, its compact size makes it very portable for on-the-go repairs. Q:Can it open all types of watch backs? A:Designed for waterproof screw-on watch case backs. Features:1. Adjustable watch case back opener for waterproof watches 2. Sturdy solid steel construction for durability 3. Jaw adjustable from 8mm to 57mm for various watch sizes 4. Compact blue design for easy portability and storage 5. Ideal for watchmakers and DIY repair enthusiasts Specifications:Product Name: Adjustable Watch Case Back Opener Remover Tool Material: Solid Steel Size: Jaw adjustable 8mm to 57mm Color: Blue Package Includes:1 Piece Adjustable Watch Case Back Opener Remover Tool (Blue) 【Adjustable Watch Back Opener】This tool features an adjustable jaw from 8mm to 57mm, making it compatible with a wide range of waterproof watch case backs 【Sturdy Solid Steel Construction】Crafted from durable solid steel, this opener is built for heavy-duty use and long-lasting performance in watch repairs 【Compact & Portable Design】Small enough to carry in your pocket or tool kit, this watch back opener is perfect for on-the-go repairs and maintenance 【Easy to Use】Simply adjust the jaw to fit your watch case back and twist to open—removes screw-on backs with ease in just seconds 【Professional-Grade Repair Tool】Ideal for watchmakers, hobbyists, and DIY enthusiasts who need a reliable tool for battery changes and case repairs