Here's what other sites are saying:
The classic Black Diamond Alpine Hammer is compatible only with the current Viper Ice Tool.
- Mountain Gear
Black Diamond Alpine & Ice Climbing Viper Alpine Hammer BD4120960000ALL1.
The Black Diamond Alpine Hammer is a hammer for the Viper Ice Tool. If your tool isn't the Viper, then move on along, as this hammer just won't work for you. Features of the Black Diamond Alpine Hammer Compatible only with the current viper ice tool