ITEM NAME:Machine Back Tool Set Watch Case Watch Press Set Watchmaker-tools With 12 Moulds Description: The item is a good tool to repair watch. Each jewelry store should have one. 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. Specification: Major Material: Iron Pole Length: About 18cm Height: About 9.5cm Package Included: 1 X Watch Back Closer 12 X Dies Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 1-2 cm differences due to manual measurement..Put a watch crystal adown at the under die and put the rear cover at a suitable position. 1 X Watch Back Closer. Putting a cloth under the watch crystal will protect the watch crystal. Choose a die which is bigger than the watch crystal and install it at screw-socket of under pliers.