The Revolution XT blades have no center, and are driven from the outside delivering several advantages:
A) The ability to make STRAIGHT or CURVE cuts.
B) Easily cut a slice off the edge of your material. The blade remains stable and rigid without wandering.
C) Use the same blade for all materials. There is no need to change blades.
D) Material will never glaze over, so there is no need to ever dress the blade.