|This article is about a/an transformation device in Kamen Rider Blade.|
- "Turn Up!"
- ―Transformation announcement[src]
The Blay Buckle (ブレバカル Bure Bakaru) is a transformation device that Kazuma Kenzaki uses to become Kamen Rider Blade. It was the second Rider System developed by B.O.A.R.D. intended as a means to combat the Undead via the fusion of Undead DNA and human DNA. The Blay Buckle was designed for specific compatibility with the ♠A: "Change Beetle" Rouse Card and harnesses the DNA of the Beetle Undead. This model utilizes the "Turn Up" mechanism to produce a stationary transformation screen, which initiates the fusion of Undead DNA with a human to produce the transformation. Coincidentally, the transformation screen itself can act as a deflective wall against assaults.
- In Kamen Rider Decade, Kenzaki uses the Evolution Caucasus Card rather than the Change Beetle Card in his Blay Buckle. This causes him to transform straight into Blade King Form rather than his default Ace Form.
- The Blay Buckle is also donned by Nao Yasuda of Kamen Rider Girls, who represents Blade in the group.