Watch Repair Kit contains 1pcs tweezers,1pcs screwdrive with 5pcs spare head of the screwdriver (not magnetic),1pcs case knife, 1pcs watch back case opener, 1pcs watch case holder, 1pcs spring bar tool, 20pcs spring bars(size:16/18/20/22/24mm,4pcs each),1pcs watch tool with 12 moulds,2pcs cleaning cloth.Which solves most watch repair requirements like opening/closing watch backs, watch band replacement, changing watch batteries, watch cleaning& maintenance, replacing a watch crystal, etc. Watch case knife is used for the watch case with a pry opening; Watch back case opener is used for watch cases with grooves, the watch back case opener can be used from 0.5-2.28inch(13-58mm), and the caliper spacing can be set by rolling the adjustment wheel to fit the grooves of your case; Screwdriver is used for watch case which is fixed by screws, the cover at of the screwdriver can be opened, the 5pcs spare head of the screwdriver is placed inside the screwdriver handle. This set of tools is