Professional Watch Case Opener Features: T-Shaped Design: Made of alloy material with two short, thick, and hard claws. Includes a case display for easy rotation. Easy to Use: Easily remove or tighten waterproof watch backs for battery changes or repairs. Adjustable to fit various watch sizes. Convenient and Portable: Easily change your watch battery yourself. Compact and easy to carry. Specifications: Type: Back Cover Remover Material: Alloy Length: 13.5 cm / 5.3 inches Width: 8 cm / 3.1 inches Handle Width: 1.5 cm / 0.6 inches Package Contents: 1 x Back Cover Opener Remover Instructions: 1. Adjust the distance between the two claws to grip the two grooves on the back cover. 2. Rotate the handle, tightening the RUT under the back cover and adjusting the lower steel teeth. 3. Rotate the back cover counterclockwise to open (the back cover must be firmly clamped). 4. Rotate the back cover clockwise during installation (apply waterproof paste for better sealing).