ITEM NAME:Adjustable Watch Repair Tool Kit Back Case Opener Cover Remover Screw Wrench f Descriptio n Descriptions: Material: Plastic color: blue Size: 7.5*7.5*3CM Weight: 28g Product List: 1X blue butterfly opener feature: Suitable for screw-in watch bottom cover, can open about 75mm bayonet distance, most of the screw cap distance is enough. How to use: Two heads are aligned with the tabs on the back cover of the watch. Whatever the ending's perfect or not, you can't disappear from my world Plastic butterfly open universal opener.1X blue butterfly opener. Plastic butterfly open universal opener. Suitable for screw-in watch bottom cover, can open about 75mm bayonet distance, most of the screw cap distance is enough. How to use: Two heads are aligned with the tabs on the back cover of the watch.