Watch Repair Tool Screw Adjustable Back Case Opener Wrench Remover Tool + BoxFeatures:Universal wrench for watch back case opening and closingKey for waterproof watch case， with 4 sets of clamps: Round， Flat， Square and ToothedThe tool is special movable screw-plug back cover of watch， easy to use， easy to carry.The largest open table 3.70 cm in diameter.Main material: SteelHow to use:Open table will implement three steel teeth to adjust to the appropriate location， choose to suit oneself watches back cover bayonet shape， on the back cover bracket， then， with the hand to the table above pressure and rotate to the left， bottom cover can be opened.Package include:1 x Watch Back Case Opener Wrench Tool Kit Set1 x Blue Storage Case