Watch Case Back Opener Watch Case Opener Tool Adjustable Watchmaker Key Tool for Battery Replacement and Other Watch Repairs High quality professional all-in-one kit watch case opening tool-made of high quality stainless steel material . This watch cover opener can be used for 99% of waterproof watches. Adjustable clamp distance from 11mm up to 56mm making this small watchmaker tool suitable for a wide range of watch sizes. Easy to use Compact size, easy to use and fully adjustable! Tips adjustable from 0.4" to 2.2" (11 mm to 56 mm) perfect for watch repairs to open the watch case of standard and water resistant watches. Also easy to transport due to the small dimensions. Quality product from durable and high-quality stainless steel!