SRAM used in its 2-groups a separate system for mounting the chainrings. Conventional chainring bolts are not compatible!
In SRAM cranks with LK 120/80 the large chainring is threaded in order to screw the chainring bolts directly.
Material: aluminum, steel
Compatibility: SRAM XX from 2010 and X0, X9, X7 from 2011
Weight: approx 15g
Consists 8 screws (4 each for small and large chainring)