OTOOLWORLD Watchmaker 5538 Watch Back Case Cover Opener Remover For ROLEX TUDOR Go to amazon.com Related posts Which is the best watch opener 5700? FeatureHigh quality watch tool1x adapter for opener #5700 and 6*size of grooved check (rings)Size: NO.0--18.5mm NO.1--20.2mm NO.2--22.5mm NO.3--26.5mm NO.4--28.3mm NO.5--29.5mm DescriptionWatchmaker 5538 Watch Back Case Cover Opener Remover For ROLEX TUDOR