ITEM NAME:Watch Bezel Inserts Watch Tools Watch Back Watchmaker Press Repair Tools Ki A9S2 Watch Bezel Inserts Watch Tools Watch Back Watchmaker Press Repair Tools Ki A9S2 Weight:About 600g Choose a die which is bigger than the watch crystal and install it at screw-socket of under pliers. Choose other die which is smaller than the rear cover and install it at screw-socket of up pliers. Put a watch crystal adown at the under die and put the rear cover at a suitable position.Lightly press down.Putting a cloth under the watch crystal will protect the watch crystal. color:blue Material:metal +ABS Size:The rod length is about 18cm and the height is about 19cm. Package Contents: 1 x Watch Back Closer 12 x Dies