This friction ball is a great alternative to the standard watch case opener High quality and hand feel. tool, makes you open the watch in an easy, precise, and safe way for any but the most difficult waterproof case backs. It's allows it to fit and evenly grip the , giving it more strength yet never scratching your watch. Easy to use; simply squeeze, , then turn. for any toolkit whether you're a professional watchmaker or a hobbyist. colour:Random color(Note: Random color, don't accept the specified color.) Material:rubber size:. 7 cm Package Contents: 1 * Watch Case Open ball Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.