Features:Comes with 12 dies allowing for 50/48mm, 46/44mm, 42/40mm, 38/36mm, 34/33mm, 32/31mm, 30/28mm, 26/24mm, 23/21mm, 20/18mm.ABS plastic dies with a metal screw in the middle make it more durable, and won't scratch your watch.Easy & quick to fix watch: only three steps - choose two suitable dies, screw them on the press tool, and then press down the handle.Good for closing your snap back watch case after repairing job, not for crystal apart. Note: Before pressing the cover, make sure to use the correct fitting dies to avoid damaging the watch.Equipped with a cleaning cloth for padding under your watch while press to protect your watch well.Specification:Material: ABS + MetalColor: blue/blackInstructions:1. Choose a die which is bigger than the watch crystal and install it at screw-socket of under pliers.2. Choose other die which is smaller than the rear cover and install it at screw-socket of up pliers.3. Put a watch crystal adown at the under die and put the rear cover at a suitable position.4. Lightly press down.5. Putting a cloth under the watch crystal will protect the watch crystal.Package included:1 x Watch back case press tool12 x Dies