Bergeon's Jaxa Mini Key Tool opens waterproof screw back watch cases. Includes a set of two chucks that are installed on the tool. Use the center wheel to open up or close together the two chucks to adjust to the screw slots on the back of the watch case, grasp and open up the watch case back.
Includes one set of 2 chucks with slots (part no. 2819-B)
Includes one set of 2 chucks with slots (part no. 2819-B)