DURABLE CONSTRUCTION: Made of high quality aluminum alloy and steel, this watch case is stable, solid and durable. Not easy to rust, corrode and oxidize. Effective Compression: This bezel closure can be used to effectively compress a waterproof case. Easy to use, helps remove watch crystals and molds without risking damage to the hand and the watch itself. EASY TO USE: This watch pressure tool applies pressure by squeezing the top handle, meaning you have full control over the pressure you use, use just enough pressure to mount the crystal or case back. Different molds for watches: 20 different molds for all watch sizes (18/20 21/23 24/26 28/30 31/32 33/34 36/38 40/42 43/45 48/50). You can easily move the aluminum alloy mold to install the correct mold. Professional use: master watch repairers, watch shops, etc. must keep the watch nearby. This watch bezel case is a solid support and fits most watches.