The adjustable case opener can easily remove or screw down the waterproof case cover to replace the battery or repair the watch. It is a necessary tool for watchmakers and watch repairers. The distance between the jaws can be adjusted between 10.5mm and 65mm, which allows it to be used to open waterproof watches of various sizes. (NOTE: It can be used to open and close most screw-back cases, but cannot be used for watches that open by prying up the bottom cover directly.) The case opener has a perfectly balanced feel and HIGH QUALITY and durability. The strong alloy steel and brass plating are designed for tough use, so it is much sturdier and more durable than other similar products. No complicated operation, you just need to fix the watch on the repair bracket or hold it firmly in your hand, then roll the adjustment wheel to set the bit distance to match the width of the case. After installing the case opener, try to turn the case cover, the cover can be opened successfully. Color: Silver Material: Metal Package Contents: 1 * Adjustable Watch Back Removal Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.