Watch Repair Tool Kit, Set of Back Opener Wrench and Large Watch Case Movement Holder for Waterproof Watch, Change Battery Yourself This is an ideal tool set for replacing batteries for any other watch repair by yourself The opener is a key can be Easily adjustable for various case dimensions (18mm to 45mm) The holder can be set in different positions for different size cases, will not scratch your watch What included: 1x key for watch-cases, 1x watch case movement holder, 6 sets of clamps 100% Satisfaction Warranty - Shop with confidence, your satisfaction is our guarantee - 90 days MONEY BACK with any reason under any condition.