ITEM NAME:Watch Back Case Opener Sticky Friction Roll Ball Screw Repair Remover BX Material: Plastic Color: Random(You may receive the same color or the colors different from the picture) Size: Ball diameter: 8cm Quantity: 1 x ball Novative tool, makes you open the watch in an easy, precise, and safe way for any but the most difficult waterproof casebacks. It's smart design allows it to fit and evenly grip the surface, giving it more strength yet never scratching your watch. Easy to use; simply squeeze, press, then turn. Perfect for any toolkit whether you're a professional watchmaker or a hobbyist. This is a tool, not a toy ball (maybe you can make it as a tool and a toy), only use to open the Screwthread watch back case..It's smart design allows it to fit and evenly grip the surface, giving it more strength yet never scratching your watch. Easy to use; simply squeeze, press, then turn. This is a tool, not a toy ball (maybe you can make it as a tool and a toy), only use to open the Screwthread watch back case.