2 New Watch Opener Screw Back Remover Wrench For Watch Repair. This is a new set of 2 watch case openers. Each opens and closes screw back water resistant watches without scratching. Both includes 12 patterned pins / grips, 4 sets in all, for a variety of casebacks. These are a replacement for the Jaxa wrench. These adjustable case openers can open Bulova, Rolex, Movado, Gruen, Longines and Accutron screw type back waterproof watches. Each measures approximately 5 1/2".