Tekno RC M4 Aluminum Serrated Locknut (4) (Gun Metal)
[TKR1213]

Tekno RC M4 Aluminum Serrated Locknut (4) (Gun Metal)
Justin - Rating: 5 of 5 Stars! Sunday, July 28, 2013
These have been probably the best lock nuts I've ever used. If you're buying a SCT410, there's no need to buy different ones, these work great.