Use Instructions:

• Insert a 6mm L-shaped allen key into the 6mm hexagonal hole of the KUROKO. 
• The protrusion in the middle of the tool serves as a guide for stable mounting as to not damage the chainring bolt. 
• Although any 6mm L shaped allen key is suitable, the Runwell STEX tool is recommended because of its low profile and stability.
• In the unlikely event that the protrusion is clogged, it can be unscrewed and serviced. 

* KUROKO was developed with reference to bolts attached to NJS certified parts. Other commercial products have bolt grooves that are shallow and may lack stability during use.