Great for opening and closing screw back case from Omega, Longines, Breitling, Oris, Seiko & Citizen or any other brand watches. Quality tool with brushed steel finish. Universal wrench for watch cases. Applicable to most watches. Steel body with 3 adjustable jaws. Three prong wrench. Key for waterproof wath-cases, with 4 sets of clamps (round, flat, square, toothed). Tool comes with 4 different type of pins: 3 chucks for slotted case, 3 chucks for case with holes, 3 chucks for Polygonal case, 3 chucks for case with grooves. Wrench length: 5 3/4" inches.