and can fit different size watch cases. It is the most effective tool for watch case opening. Fun of DIY - It may be way too expensive to pay a jeweler to replace the battery. Now with this easy-use watch tool set, you can do it yourself! Widely used- Great Tools for Waterproof watch case opening, batteries replacing and watch repairing. The watch case holder tool will minimize the risk of slipping and scratching. Durable life time, strong material gives the opener a long-last working time. It is also water resistant and will not easily get rust or damaged. Color: blue Material: stainless steel Size: 70mm * 28mm * 11mm (L * W * H) Adjustable jaw distance from 11 mm to 54 mm. Compact size, easy to use. Works great on 99% waterproof watches (with grooves on the back). How to Use Turn the black knob and make it fit snugly around the watch face plate. Then roll the adjustment wheel of the Watch Back Case Opener to set the bit spacing to fit your watch's back case grooves. Just turn it and your watch back case is open up. Package Contents: 1 x Watch Back Case Opener Only the above package content, other products are not included. Note: Light shooting 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.