The 2005 Kris Holm/ONZA cranks are equal the known ONZA cranks which never mades trouble.
The new 2005 ones will also fit for old ONZA unicylces.
All 2005 Kris Holm and ONZA unicycles comes with this cranks.

*High strength, oversize CrMo tubing, 1/2" Q-factor
*High precision press-fit onto 36 spline axle
*Available in 165mm
*Weight: 520g - 600g
*Sold in pairs