Constructed with brass and iron materials, ensuring durability and resistance to corrode for long-lasting use. Features an adjustable devise that securely holds screwdriver handles from 2.5mm to 5mm, making it versatile for various tools. Compact and lightweight, this sharpening tool is easy to carry in your toolkit, perfect for on-the-go repairs. Ideal for sharpening precision screwdrivers and fixing damaged blades, enhancing your watch repair experience. Includes step-by-step instructions for easy use, allowing you to achieve professional results in your jewelry and watch repairs., Manufacturer: TLKYQTVBG