Simplified watch back case crystal press tool, supplied with 12 nylon dies. This tool has an angled leverage arm for proper closure. Can be used on press type watch cases. It is possible use it on a table top or hold in your hands without removing metal bracelets; will not destroy your watch case backs or crystals. Easily, safely, and swiftly.                                                                                                                                     The sizes of 12 nylon dies: 24/26, 28/30, 31/32, 33/34, 36/38, 40/42mm; 24/26, 28/30, 31/32, 33/34, 36/38, 40/42mm. One pair has different shapes, but share common size.