Adjustable tempered pins for easy use on water cases The watch case holder tool with 4 hard adjustable plastic pins minimize the risk of slipping and scratching It can be set in different positions for different cases with different sizes The perfect professional tool set for watch repairing, note: The appearance of watch back base opener has been updated Watch Back Case Opener This is a new 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 Size: 70mm X 28mm X 11mm Material: alloy,plastic Color: blue & yellow It is used for securing watch cases while opening and closing waterproof backs. The large case holder is useful for holding large watches, including Divers-type 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 unit comes with base and 4 adjustable nylon pegs. The tool vise may be mounted on a desk or work bench. Unit firmly holds cases up 70mm in diameter. Package included: 1 x Watch Back Case Opener 1 x Watch Holder 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.