Handle-Ken

"Turn!"

- Power-up announcement via 1st & 2nd steer

"U-Turn!"

- Power-up announcement via 3rd steer

"Drift Kaiten!"

- Finisher announcement via horn after one steer

"Hissatsu: (Shift Car), Full Throttle!"

- Finisher announcement via Drive Driver

The Handle-Ken (ハンドル剣) is a bladed weapon wielded by Kamen Rider Drive, resembling the steering wheel from Tridoron. It first appears in episode 4.

Shinnosuke is the one who names this weapon thanks to the rather oddly placed steering wheel on the hand guard, though Mr. Belt disapproves of the literal name. When summoned, the Handle-Ken comes from the front portion of Tridoron's hollow section.

Usage
The Handle-Ken's blade is made from S0-1, an experimental compound that can also repair Shift Cars. The blade itself is very sharp albeit weirdly balanced, but it can be made even more powerful by turning the steering wheel on the hilt, which announces "Turn" (ターン) and powers up for the next attack. Initiating a third Turn motion in a row causes the Handle-Ken to instead announce "U-Turn" (Ｕターン) and allow Drive to execute the Turn Slash (ターンスラッシュ) attack, where he drifts across the battlefield before he strikes the enemy with a powerful slash.

In terms of Drive's forms, Type Wild has the most compatibility with the Handle-Ken due to its enhanced strength and defensive capabilities fitting with the close range combat nature of this weapon.

Drive can use the in a similar manner to the  simply by placing them on the Handle-Ken's insignia and spinning it. When Tridoron transforms into an and combines with, the Handle-Ken becomes part of a special control interface for Drive so that he can control the combined mecha with the Ninningers.

Finishing attacks
The Handle-Ken's Full Throttle finisher Drift Slash (ドリフトスラッシュ) is activated when a Shift Car is loaded into the Shift Landing Panel (シフトランディングパネル) slot behind the blade after turning the Advanced Ignition on the Drive Driver, with different attacks being performed depending on the car used.
 * Dream Vegas: When Drive slashes an enemy three times, the number 7 appears with cards, chips, and lottery-related items bursting out, which then reflects an image of the number 777 on the target.
 * Speed: When Drive slashes an enemy, a blue automobile light trail appears and reflects a red then blue image of either a speedometer, a rev counter, or a fuel gauge on the target.
 * Midnight Shadow: When Drive slashes, a giant energy shuriken is shot at the enemy.
 * Wild: Drive strikes the enemy with one energized slash before he spins rapidly and traps the target in a series of deadly spinning slashes until they are destroyed.

If Drive presses the Handle-Ken's "horn" after turning its steering wheel once, it announces "Drift Kaiten" (ドリフト回転) and allows him to execute a secondary finisher where he spins like a top and slashes the enemy several times as each slash makes a red light-like circle appear, while also leaving skid marks on the ground.

Arms Weapon
The Handle-Ken is the Arms Weapon wielded by either an Armored Rider or a New Generation Rider when they transform into Drive Arms, which is assumed by Kamen Rider Gaim in Kamen Rider × Kamen Rider Drive & Gaim: Movie War Full Throttle. Though the only weapon of Drive Arms used onscreen, the Handle-Ken is paired with the Door-Ju in the Arms Change series.

Trivia

 * The way Drive turns the steering wheel on the Handle-Ken to empower his slash is similar to how Kiva Emperor Form slides the Zanvat-bat on the Zanvat Sword to power up his slash.
 * Similar to Ryotaro Nogami/Den-O Liner Form and the lackluster christening of his DenKamen Sword's Densha Giri/Train Slash finisher, other characters disapprove of Shinnosuke's poor naming sense. In this case, Mr. Belt.
 * In Type TV-KUN: Hunter & Monster! Chase The Mystery of The Super Thief!, the Monster is seen wielding the Handle-Ken by its blade.