Build Driver

The Build Driver (ビルドドライバー) is the transformation device used by both Kamen Rider Build and Kamen Rider Claws. It uses Fullbottles as its primary collectible device.

Transformation
Kamen Rider Build transforms by inserting two Fullbottles into the Build Driver's Building Modules (ビルディングモジュール) and plugging them into the Twin Fullbottle Slots. The user then turns the Vortex Lever (ボルテックレバー), a crank that generates power to the Vortex Charge (ボルテックチャージャー) energy core generator unit by turning the lever. This gives the Nitro Dynamo inside the Vortex Charge the momentum it needs to generate power for transformation and finishers. Larger amounts of energy can be generated by increasing the momentum of turning the VortexLever and rotation speed of the Vortex Charge.

In a rare instance for Rider Belts, in Episode 1, the inner workings of the Build Driver were seen during transformation. As the Vortex Lever and Vortex Charge turns, it moves the gears and pistons inside the belt which pump essence from the Fullbottles out of their containers through pneumatic tubes, which move out of the belt and form the base for assembly of the suit. If the user is transforming into a Best Match form, the Driver then initializes the Snap Ride Builder (スナップライドビルダー) after the essences have hardened into the suit armor, snapping the two parts together and completing the transformation.

The Build Driver is layered in an alloy called the Safety Guard Case, designed to resist high temperatures, high impacts of force and attacks by the Smash. As a security feature, the belt uses the Qualifizer (クオリファイザー) fastener to do a biometric scan of its wearer to determine if it is the correct user. If it is not, the belt will not function and go into a protective shutdown state. If it is the user, the belt will continue to operate normally.

An ideal combination of two matching Fullbottles will create a Best Match (ベストマッチ) form, but any other imperfect combination is known as a Trial Form (トライアルフォーム).

Kamen Rider Claws transforms by inserting the Dragon Fullbottle into the ClawsDragon, before inserting it into the Build Driver, and turning the crank.

Finishers
While transformed, Build initiates a finishing move by turning the Vortex Lever. Best Matches use the Vortex Finish (ボルテックフィニッシュ), and Trial Forms use the Vortex Attack (ボルテックアタック).

Snap Ride Builder
Transformation Setups=

Portrayal
The voice of the Build Driver was provided by KORBY.