Easy Watch Battery Replacement Kit-- This kit consists of watch case opener, watch case holder and tweezers. It helps you open the watch cover to replace the watch battery and clean the dust inside the watch. The tweezers are used to remove the battery. Applicable watch type-- The watch case opener is only suitable for the watch cover which opens by twisting and does not not apply to other types of watches that open the watch cover. How to use the watch case opener -- Watch cover opener The range of use is 15-60mm and the spacing of the drill bits suitable for the watch cover can be adjusted by rotating the adjustment wheel. The purpose of the watch case holder -- The case holder can help secure the watch and reduce the risk of slipping and scratching the watch. It is suitable for watches of different sizes and can be used for watches with a diameter of up to 50mm. Picture user manual-- The kit comes with a User Manual. The detailed pictures tell you the correct use method, avoid damage to your watch by wrong operation, and help you solve the problem of the watch at home.