The CCP-22 or CWP-7 will pull cranks from spindes using the 8mm threaded bolt or nut. The large threading section of the tool is 22mm and threads into the arm. The inner thread of the tool will drive against the spindle and will drive the arm from the spindle. The 8mm thread is about the same size as the 8mm hex wrench shaft. Truvativ "Power Spline" spindes use an 8mm threaded bolt as does the common square spindles use an 8mm thread.
Common square spindle axle inside square hole of crank
8mm threaded bolt from the Truvativ Power Spline system