Larger Watch Back Case Cover Opener Adjustable Repair Wrench Watchmaker Tool. Specially Suitable for larger diameter watched About this Item PROFESSIONAL WATCH CASE OPENER - Adjustable watch back cover opener can easily remove or screw down the waterproof watch back cover to replace the battery or repair the watch. It is a necessary tools for watchmakers and watch repairing workers WIDE RANGE of ADAPTATION - The jaw distance can be adjusted between 10.5mm and 55mm, it be used to open waterproof watches of different sizes. (NOTE : It be used to open and close most screw-in watch back cases, can not be used for watches that pry open the bottom cover directly) PERFECT DESIGN - Watch Case Opener Tool have a Perfectly Weighted Feel and HIGH QUALITY Durability. The strong Alloy Steel and Brass Plating is designed for tough use, so it is much sturdy and more durable than other similar products EASY to USE - No complicated operation, you just need to fix the watch on the repair bracket or hold firmly in the hand, then roll the adjusting wheel to set the bit spacing that matches the width of the case. After installing the watch case opener, try turning the watch back cover, The cover can be opened successfully LIFETIME GUARANTEE - If anything happens to your Watch Back Case Opener Tool, we will replace it no questions asked. No charge to you. Guaranteed. Buy Now with Peace Of Mind Description Specification: Material: 316L Stainless steel + Zinc Alloy Steel + Brass Plating Length: Approx. 18.5cm / 7.28inch Net Weight: Approx. 115g Maximum Watch Case Opening Diameter: 55mm NOTE: 1. Light shooting and different displays may cause the color of the item in the picture a little different from the real thing 2. Applicable to the Watch with grooves on the back cover