Master Watch Case Opener Opens all sizes and shapes of waterproof watch cases. Comes with four sets of pins for case backs with notches holes knurled or polygon. Because of the L-G patented closing system, watch backs can be unscrewed without being scratched. Pins and accessories also available. 5-1/2 in length. You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it!