![Replacement Chuck for Universal Watch Case Opener](http://perrinwatchparts.com/cdn/shop/products/64-4718-A-300_300x300.jpg?v=1679669655)
Replacement Chuck for Universal Watch Case Opener For opening polygonal, slotted, and grooved cases. Instant adjustment and fixing of the key size by one nut. With 2 double ended fixed chucks held in the arms of the key. Replacement bolt also available separately.