The watch case holder tool with 4 hard adjustable pins minimize the risk of slipping and scratching It can be set in different positions for different cases with different sizes The professional tool set for watch repairing, note: The appearance of watch back base opener has been updated This is a waterproof watch back case wrench. Simple to use and fully adjustable, it have adjustable tempered pins for easy use on water cases. Its compact size makes it very convenient to use. Jaw distance is adjustable from 12mm to 57mm It is used for securing watch cases while opening and closing waterproof backs. watches in place, while using a hand wrench to open case back. The tool is used to minimize the risk of slipping and scratching the backs of watches. The tool can also be used as a holder while watch is being worked on. The tool vise may be mounted on a desk or work bench. Unit firmly holds cases up 70mm in diameter. Size: 70mm X 28mm X 11mm Watch Holder size: 50*50mm Material: steel ,metal,plastic Color: blue,yellow Package Contents: 1 x Watch Back Case Opener 1 x Watch Holder Only the above package content, other products are not included. Note: Light 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.