|This article is about a/an weapon in Kamen Rider Fourze.|
The Hammer Module (ハンマーモジュール Hanmā Mojūru) is the Fourze Module which is equipped on the left arm (though the majority of the Module covers only his hand) of Kamen Rider Fourze via the square-based Hammer Switch (ハンマースイッチ Hanmā Suitchi). Though shaped like a squeaky hammer, the Hammer Module allows Fourze to do incredible damage. He can also slam the Module onto the ground to make a shock wave travel through the ground to floor a Zodiarts. However, if the Hammer Module hits something that is too hard to hit, the shock wave instead travels backwards, harming the user. During the Aries Zodiarts incident, this Astroswitch was rendered useless after Aries cuts it off from the Fourze System by making Fourze's arm go to "sleep".