Extra large case watch case opener wrench will open and close most waterproof watch casebacks. The wrench can be used for changing watch batteries, movements and more. The tool includes 4 sets of interchangeable pins round, flat, square and toothed to open various types of watches. The pins are designed well and will not fall out of wrench. Easy to operate, the long knurled handle twists to adjust to the size of the watch back. Opens watch backs from 19mm-60mm. Tool measures 5 1/2 x 2 x 3 /4 also, included in set is a spring bar remover tool. Spring bar remover tool is used for removing spring bars from a watch case. The tool can be used to change watch bands, buckles or clasps on leather straps. The tool handle has a millimeter gauge on the side for selecting the proper size bar. The ends of the tool are tempered steel with replaceable forked end and pointed end. Set comes complete in a clean storage box. Instructions included. Manufactured for Paylak Tool