Features: Key for waterproof watchcases,with 4 sets of clamps(round,flat,square,toothed)High quality all steel constructionEasily adjustable for various case dimensions (18mm to 60mm)Protable handly box set design,easy to carrySpecifications：Length: 17.5 cmWidth: 7.5 cmHeight: about 3 cmWeight: 0.25 kgWorkable Size：18 mm – 60 mmPackage include:1 x Watch case opener tool3 x Round clamp3 x Flat clamp3 x Square clamp3 x Toothed clamp